Data

NameRodríguez Vázquez, Ángel Benito
DepartmentElectrónica y Electromagnetismo
Knowledge areaElectrónica
Professional categoryCatedrático de Universidad
E-mailRequest
         

  Statistics

  • Items

    412

  • Visits

    25483

  • Downloads

    37272

  Publications

 

Article
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Architecture-level optimization on digital silicon photomultipliers for medical imaging

Bandi, Franco; Ilisie, Victor; Vornicu, Ion; Carmona Galán, Ricardo; Benlloch, José M.; Rodríguez Vázquez, Ángel Benito (Multidisciplinary Digital Publishing Institute (MDPI), 2022-01-01)
Silicon photomultipliers (SiPMs) are arrays of single-photon avalanche diodes (SPADs) connected in parallel. Analog silicon ...
PhD Thesis
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On The Design of Compressed Sensing CMOS Imagers

Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito; Trevisi, Marco (2021-07-23)
El muestreo compresivo (CS) es una teoría de muestreo y una alternativa al proceso de muestreo basado en el teorema de ...
PhD Thesis
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Low-Power Artifact-Aware ImplantableNeural RecordingMicrosystem for Brain- Machine Interfaces

Delgado Restituto, Manuel ; Rodríguez Vázquez, Ángel Benito; Pérez Prieto, Norberto (2021-06-02)
Neuroscience research into how complex brain functions are implemented at cell level requires in vivo neural recording ...
Article
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A Low-Resources TDC for Multi-Channel Direct ToF Readout Based on a 28-nm FPGA

Parsakordasiabi, Mojtaba; Vornicu, Ion; Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo (Multidisciplinary Digital Publishing Institute (MDPI), 2021-01-01)
In this paper, we present a proposed field programmable gate array (FPGA)-based time-to-digital converter (TDC) architecture ...
PhD Thesis
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Diseño de circuitos integrados para interfaces neuronales implantables

Delgado Restituto, Manuel ; Rodríguez Vázquez, Ángel Benito; Valtierra, José Luis (2020-06-10)
Progress in microfabrication technology has opened the way for new possibilities in neuroscience and medicine. Chronic, ...
PhD Thesis
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Design of CMOS Digital Silicon Photomultipliers with ToF for Positron Emission Tomography

Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito; Bandi, Franco Nahuel (2020-05-29)
This thesis presents a contribution to the design of single-photon detectors for medical imaging. Specifically, the focus ...
Article
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Compressive Imaging Using RIP-Compliant CMOS Imager Architecture and Landweber Reconstruction

Trevisi, Marco; Akbari, Ali; Trocan, Maria; Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo (Institute of Electrical and Electronics Engineers, 2020-01-01)
In this paper, we present a new image sensor architecture for fast and accurate compressive sensing (CS) of natural images. ...
Final Degree Project
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Diseño de un convertidor de tiempo a digital para la estimación del tiempo de vuelo de fotones

Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito; Piña Martínez, Manuel (2020-01-01)
Los Convertidores de Tiempo a Digital (TDC) son dispositivos que se basan en medir la diferencia entre dos señales de ...
Article
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PreVIous: A Methodology for Prediction of Visual Inference Performance on IoT Devices

Velasco Montero, Delia; Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2020-01-01)
This article presents PreVIous, a methodology to predict the performance of convolutional neural networks (CNNs) in terms ...
Master's Final Project
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Diseño de un sensor de imagen asíncrono autoalimentado mediante captación de energía solar

Leñero Bardallo, Juan Antonio; Rodríguez Vázquez, Ángel Benito; Gómez Merchán, Rubén (2020-01-01)
En este Trabajo de Fin de Máster se ha diseñado un sensor asíncrono con una arquitectura del tipo Time-to-First-Spike ...
PhD Thesis
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Sistema de predicción epileptogenica en lazo cerrado basado en matrices sub-durales

Delgado Restituto, Manuel ; Rodríguez Vázquez, Ángel Benito; Romaine, James Brian (2019-06-28)
The human brain is the most complex organ in the human body, which consists of approximately 100 billion neurons. These ...
Article
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Compact Real-Time Inter-Frame Histogram Builder for 15-Bits High-Speed ToF-Imagers Based on Single-Photon Detection

Vornicu, Ion; Darie, Ángela; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
Time-of-flight (ToF) image sensors based on single-photon detection, i.e., SPADs, require some filtering of pixel readings. ...
Presentation
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Low-Noise and High-Efficiency Near-IR SPADs in 110nm CIS Technology

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
Photon detection at longer wavelengths is much desired for LiDAR applications. Silicon photodiodes with deeper junctions ...
Article
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Characterization-Based Modeling of Retriggering and Afterpulsing for Passively Quenched CMOS SPADs

Moreno García, Manuel; Pancheri, Lucio; Perenzoni, Matteo; Río Fernández, Rocío del; Guerra Vinuesa, Oscar; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
The current trend in the design of systems based on CMOS SPADs is to adopt smaller technological nodes, allowing the ...
Article
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Offset-calibration with Time-Domain Comparators Using Inversion-mode Varactors

Fiorelli, Rafaella; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
This paper presents a differential time-domain comparator formed by two voltage controlled delay lines, one per input ...
Presentation
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A High TCMRR, Inherently Charge Balanced Bidirectional Front-End for Multichannel Closed-Loop Neuromodulation

Valtierra, José Luis; Fiorelli, Rafaella; Pérez Prieto, Norberto; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
This paper describes a multichannel bidirectional front-end for implantable closed-loop neuromodulation. Stimulation ...
Presentation
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On the Correlation of CNN Performance and Hardware Metrics for Visual Inference on a Low-Cost CPU-based Platform

Velasco Montero, Delia; Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
While providing the same functionality, the various Deep Learning software frameworks available these days do not provide ...
Presentation
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A Sub-μVRms Chopper Front-End for ECoG Recording

Pérez Prieto, Norberto; Valtierra, José Luis; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
This paper presents a low-noise, low-power fully differential chopper-modulated front-end circuit intended for ECoG signal ...
Presentation
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Artifact-Aware Analogue/Mixed-Signal Front-Ends for Neural Recording Applications

Pérez Prieto, Norberto; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
This paper presents a brief review of techniques to overcome the problems associated with artifacts in analog frontends ...
Article
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Phase Synchronization Operator for On-Chip Brain Functional Connectivity Computation

Delgado Restituto, Manuel; Romaine, James Brian; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
This paper presents an integer-based digital processor for the calculation of phase synchronization between two neural ...
Presentation
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A Sub-µW Reconfigurable Front-End for Invasive Neural Recording

Valtierra, José Luis; Fiorelli, Rafaella; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
This paper presents a sub-μW ac-coupled reconfigurable front-end for the purpose of neural recording. The proposed topology ...
Presentation
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ToF Estimation Based on Compressed Real-Time Histogram Builder for SPAD Image Sensors

Vornicu, Ion; Darie, Ángela; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2019-01-01)
This paper presents a FPGA implementation of a novel depth map estimation algorithm for direct time-of-flight CMOS image ...
Presentation
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A 32 Input Multiplexed Channel Analog Front-End with Spatial Delta Encoding Technique and Differential Artifacts Compression

Pérez Prieto, Norberto; Fiorelli, Rafaella; Valtierra, José Luis; Pérez García, Pablo; Delgado Restituto, Manuel ; Rodríguez Vázquez, Ángel Benito (IEEE Computer Society, 2019-01-01)
This paper describes a low-noise, low-power and high dynamic range analog front-end intended for sensing neural signals. ...
Article
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Applications of event‐based image sensors—Review and analysis

Leñero Bardallo, Juan Antonio; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Wiley, 2018-08-01)
The spread of event‐driven asynchronous vision sensors during the last years has increased significantly the industrial ...
Presentation
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1D Cellular Automata for Pulse Width Modulated Compressive Sampling CMOS Image Sensors

Trevisi, Marco; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2018-01-01)
Compressive sensing (CS) is an alternative to the Shannon limit when the signal to be acquired is known to be sparse or ...
Presentation
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An Experimentally-Validated Verilog-A SPAD Model Extracted from TCAD Simulation

López Martínez, Juan Manuel; Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2018-01-01)
Single-photon avalanche diodes (SPAD) are photodetectors with exceptional characteristics. This paper proposes a new ...
Article
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Optimum Selection of DNN Model and Framework for Edge Inference

Velasco Montero, Delia; Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (IEEE, 2018-01-01)
This paper describes a methodology to select the optimum combination of deep neuralnetwork and software framework for ...
Article
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On the Analysis and Detection of Flames Withan Asynchronous Spiking Image Sensor

Leñero Bardallo, Juan Antonio; Guerrero Rodríguez, José María; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (IEEE, 2018-01-01)
We have investigated the capabilities of a customasynchronous spiking image sensor operating in the ...
Article
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Real-Time Inter-Frame Histogram Builder for SPAD Image Sensors

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2018-01-01)
CMOS image sensors based on single-photon avalanche-diodes (SPAD) are suitable for 2D and 3D vision. Limited by uncorrelated ...
Article
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Performance Analysis of Real-Time DNN Inference on Raspberry Pi

Velasco Montero, Delia; Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (SPIE, 2018-01-01)
Deep Neural Networks (DNNs) have emerged as the reference processing architecture for the implementation of multiple ...
Presentation
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Concurrent focal-plane generation of compressed samples fromtime-encoded pixel values

Trevisi, M.; Bandala, H.C.; Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (IEEE, 2018-01-01)
Compressive sampling allows wrapping the relevant content of an image in a reduced set of data. It exploits the sparsity ...
Presentation
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Live Demonstration: Low-Power Low-CostCyber-Physical System for Bird Monitoring

García-Rodríguez, A.; Rodríguez-Sakamoto, R.; Fernández Berni, Jorge; Río Fernández, Rocío del; Marín, J.; Baena, M.; Bustamante, J.; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (IEEE, 2018-01-01)
This live demonstration showcases a cyber-physical system tailored for inexpensive remote bird monitoring. A comprehensive ...
Article
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Asynchronous spiking pixel with programmable sensitivity to illumination

Leñero Bardallo, Juan Antonio; Delgado Restituto, Manuel ; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2018-01-01)
A spiking pixel to be used in image sensor arrays for asynchronous frame-based operation is presented. The pixel features ...
Presentation
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On-The-Fly Deployment of Deep Neural Networks on Heterogeneous Hardware in a Low-Cost Smart Camera

Velasco Montero, Delia; Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Association for Computing Machinery, 2018-01-01)
This demo showcases a low-cost smart camera where different hardware configurations can be selected to perform image ...
Article
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CMOS Vision Sensors: Embedding Computer Vision at Imaging Front-Ends

Rodríguez Vázquez, Ángel Benito; Fernández Berni, Jorge; Leñero Bardallo, Juan Antonio; Vornicu, Ion; Carmona Galán, Ricardo (IEEE, 2018-01-01)
CMOS Image Sensors (CIS) are key for imaging technol-ogies. These chips are conceived for capturing opticalscenes ...
Presentation
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Color Tone-Mapping Circuit for a Focal-Plane Implementation

Nunes, Gustavo M. S.; Oliveira, Fernanda D. V. R.; Gomes, Jose Gabriel R. C.; Petraglia, Antonio; Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (IEEE, 2018-01-01)
In this article, we present a review of the driving principles and parameters of a previously reported focal-plane ...
Final Degree Project
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Diseño de “buffers” para el control de píxeles en sensores ToF

Rodríguez Vázquez, Ángel Benito; Balmaseda Delgado, Antonio Jesús (2017-01-01)
La tecnología de tiempo de vuelo se muestra hoy como una muy buena opción para 3D ‘imaging’. Sin embargo, los sensores con ...
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Compensation of PVT Variations in ToF Imagers with In-Pixel TDC

Rodríguez Vázquez, Ángel Benito; Vornicu, Ion; Carmona Galán, Ricardo (MDPI, 2017-01-01)
The design of a direct time-of-flight complementary metal-oxide-semiconductor (CMOS) image sensor (dToF-CIS) based on a ...
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TFET-based Well Capacity Adjustment in Active Pixel Sensor for Enhanced High Dynamic Range

Fernández Berni, Jorge; Niemier, M.; Hu, X.S.; Lu, H.; Li, W.; Fay, P.; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
We present a Tunnel Field-Effect Transistor (TFET)-based pixel circuit for well capacity adjustment that does not require ...
Article
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A CMOS Digital SiPM With Focal-Plane Light-Spot Statistics for DOI Computation

Vornicu, Ion; Bandi, Franco; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
Silicon photomultipliers can be used to infer the depth-of-interaction (DOI) in scintillator crystals. DOI can help to ...
Article
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Low-Power CMOS Vision Sensor for Gaussian Pyramid Extraction

Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Fernández Berni, Jorge; Carmona Galán, Ricardo; Cabello, D.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
This paper introduces a CMOS vision sensor chip in a standard 0.18 μm CMOS technology for Gaussian pyramid extraction. The ...
Article
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System-Level Design of a 64-Channel Low Power Neural Spike Recording Sensor

Delgado Restituto, Manuel; Rodríguez Pérez, Alberto; Darie, Ángela; Soto Sánchez, Cristina; Fernández Jover, Eduardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
This paper reports an integrated 64-channel neural spike recording sensor, together with all the circuitry to process and ...
Article
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A Wide Linear Dynamic Range Image Sensor Based on Asynchronous Self-Reset and Tagging of Saturation Events

Leñero Bardallo, Juan Antonio; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
We report a high dynamic range (HDR) image sensor with a linear response that overcomes some of the limitations of sensors ...
Presentation
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Compressive image sensor architecture with on-chip measurement matrix generation

Trevisi, Marco; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
A CMOS image sensor architecture that uses a cellular automaton for the pseudo-random compressive sampling matrix generation ...
Presentation
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Characterization of electrical crosstalk in 4T-APS arrays using TCAD simulations

López Martínez, Juan Manuel; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
TCAD simulations have been conducted on a CMOS image sensor in order to characterize the electrical component of the ...
Presentation
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Real-time phase correlation based integrated system for seizure detection

Romaine, James Brian; Delgado Restituto, Manuel; Leñero Bardallo, Juan Antonio; Rodríguez Vázquez, Ángel Benito (The Society of Photo-Optical Instrumentation Engineers, 2017-01-01)
This paper reports a low area, low power, integer-based digital processor for the calculation of phase synchronization ...
Presentation
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In the quest of vision-sensors-on-chip: Pre-processing sensors for data reduction

Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo; Fernández Berni, Jorge; Brea Sánchez, Víctor; Leñero Bardallo, Juan Antonio (Society for Imaging Science and Technology, 2017-01-01)
This paper shows that the implementation of vision systems benefits from the usage of sensing front-end chips with embedded ...
Presentation
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Pipeline AER arbitration with event aging

Leñero Bardallo, Juan Antonio; Pérez Peña, Fernando; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
We present a simple circuit to handle communication between cells of neuromorphic arrays. It allows cells to operate ...
Presentation
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Design of a compact and low-power TDC for an array of SiPM's in 110nm CIS technology

Bandi, Franco; Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
Silicon photomultipliers (SiPMs) are meant to substitute photomultiplier tubes in high-energy physics detectors and nuclear ...
Presentation
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A chaotic switched-capacitor circuit for characteristic CMOS noise distributions generation

Pérez Prieto, Norberto; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
A switched-capacitor circuit is proposed for the generation of noise resembling the typical noise spectral density of MOS ...
Presentation
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A sun sensor implemented with an asynchronous luminance vision sensor

Leñero Bardallo, Juan Antonio; Guerrero Rodríguez, José María; Farian, Łukasz; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
A sun sensor implemented with a spiking pixel matrix is reported. It is the very first one based on an asynchronous ...
Presentation
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A 2.2 μW analog front-end for multichannel neural recording

Valtierra, José Luis; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
In this paper an analog front-end for the multi-channel implantable recording of neural signals is presented. It is comprised ...
Article
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Arrayable Voltage-Controlled Ring-Oscillator for Direct Time-of-Flight Image Sensors

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
Direct time-of-flight (d-ToF) estimation with high frame rate requires the incorporation of a time-to-digital converter ...
Article
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Sun Sensor Based on a Luminance Spiking Pixel Array

Leñero Bardallo, Juan Antonio; Farian, Lukasz; Guerrero Rodríguez, Jesús Manuel; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
We present a novel sun sensor concept. It is the very first sun sensor built with an address event representation spiking ...
Presentation
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Live demonstration: Photon counting and direct ToF camera prototype based on CMOS SPADs

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
This demonstrator reveals the performance and features of a single photon avalanche diode (SPAD) camera prototype. It is ...
Article
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Gaussian Pyramid: Comparative Analysis of Hardware Architectures

Oliveira, Fernanda DV.R.; Gomes, José Gabriel; Fernández Berni, Jorge; Carmona Galán, Ricardo; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
This paper addresses a comparison of architectures for the hardware implementation of Gaussian image pyramids. Main ...
Presentation
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Photon Counting and Direct ToF Camera Prototype Based on CMOS SPADs

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2017-01-01)
This paper presents a camera prototype for 2D/3D image capture in low illumination conditions based on single-photon ...
PhD Thesis
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Diseño CMOS de un sistema de visión “on-chip” para aplicaciones de muy alta velocidad

Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Jiménez Garrido, Francisco José (2016-02-08)
Esta Tesis presenta arquitecturas, circuitos y chips para el diseño de sensores de visión CMOS con procesamiento paralelo ...
Final Degree Project
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Sobre el uso de técnicas chopper para la reducción del ruido flicker en amplificadores para la captación de señales neuronales

Rodríguez Vázquez, Ángel Benito; Pérez Prieto, Norberto (2016-01-01)
La captación de señales neuronales mediante electrodos conectados a circuitos micro-electrónicos es necesaria para ...
Presentation
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Pixel-wise parameter adaptation for single-exposure extension of the image dynamic range

Carmona Galán, Ricardo; Leñero Bardallo, Juan Antonio; Fernández Berni, Jorge; Rodríguez Vázquez, Ángel Benito (Association for Computing Machinery, 2016-01-01)
High dynamic range imaging is central in application fields like surveillance, intelligent transportation and advanced ...
Presentation
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Live Demonstration: Single-Exposure HDR Image Acquisition Based on Tunable Balance between Local and Global Adaptation

Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
This live demonstration showcases a high dynamic range technique that compresses wide ranges of illuminations into the ...
Article
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Single-Exposure HDR Technique Based on Tunable Balance Between Local and Global Adaptation

Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
This brief describes a high-dynamic-range technique that compresses wide ranges of illuminations into the available signal ...
Presentation
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In-pixel Voltage-Controlled Ring-Oscillator for Phase Interpolation in ToF Image Sensors

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (2016-01-01)
The design and measurements of a CMOS pseudodifferential voltage-controlled ring-oscillator (VCRO) are presented. It is ...
Presentation
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Effects of capacitors non-idealities in un-even split-capacitor array SAR ADCs

Fiorelli, Rafaella; Guerra Vinuesa, Oscar; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
This paper studies the effects of capacitors non-idealities in the performance of un-even split-capacitor SAR ADCs. Also, ...
Presentation
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Hardware-Aware Performance Evaluation for the Co-Design of Image Sensors and Vision Algorithms

Villegas Pachón, C.; Carmona Galán, Ricardo; Fernández Berni, Jorge; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
The top-down approach to system design allows obtaining separate specifications for each subsystem. In the case of vision ...
Article
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Image Sensing Scheme Enabling Fully-Programmable Light Adaptation and Tone Mapping with a Single Exposure

Fernández Berni, Jorge; Oliveira, Fernanda D.V.R.; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
This letter presents new insights into a high dynamic range (HDR) technique recently reported. We demonstrate that two ...
Presentation
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Mixed-signal quadratic operators for the feature extraction of neural signals

Delgado Restituto, Manuel; Fiorelli, Rafaella; Carrasco Robles, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
This paper presents design principles for reusing charge-redistribution SAR ADCs as digital multipliers. This is illustrated ...
Chapter of Book
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Image Feature Extraction Acceleration

Fernández Berni, Jorge; Suárez Cambre, Manuel; Carmona Galán, Ricardo; Brea Sánchez, Víctor Manuel; Río Fernández, Rocío del; Cabello, D.; Rodríguez Vázquez, Ángel Benito (Springer, 2016-01-01)
Image feature extraction is instrumental for most of the best-performing algorithms in computer vision. However, it is ...
Presentation
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Integer-based digital processor for the estimation of phase synchronization between neural signals

Romaine, James Brian; Delgado Restituto, Manuel; Leñero Bardallo, Juan Antonio; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
This paper reports a low area, low power, integer-based neural digital processor for the calculation of phase synchronization ...
Presentation
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Non-recursive method for motion detection from a compressive-sampled video stream

Trevisi, Marco; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
This paper introduces a non-recursive algorithm for motion detection directly from the analysis of compressed samples. The ...
Presentation
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A 76nW, 4kS/s 10-bit SAR ADC with offset cancellation for biomedical applications

Delgado Restituto, Manuel; Carrasco Robles, Manuel; Fiorelli, Rafaella; Ginés Arteaga, Antonio José; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
This paper presents a 10-bit fully-differential rail-to-rail successive approximation (SAR) ADC designed for biomedical ...
Presentation
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A 4-mode reconfigurable low noise amplifier for implantable neural recording channels

Valtierra, José Luis; Rodríguez Vázquez, Ángel Benito; Delgado Restituto, Manuel (Institute of Electrical and Electronics Engineers, 2016-01-01)
In this paper a reconfigurable implantable low noise amplifier for the recording of neural signals is presented. It is ...
Presentation
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High-Level Performance Evaluation of Object Detection Based on Massively Parallel Focal-Plane Acceleration Requiring Minimum Pixel Area Overhead

Parra Barrero, Eloy; Fernández Berni, Jorge; Oliveira, Fernanda D.V.R.; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Springer, 2016-01-01)
Smart CMOS image sensors can leverage the inherent data-level parallelism and regular computational flow of early vision ...
Presentation
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Focal-Plane Scale Space Generation with a 6T Pixel Architecture

Oliveira, Fernanda D.V.R.; Gomes, José Gabriel; Carmona Galán, Ricardo; Fernández Berni, Jorge; Rodríguez Vázquez, Ángel Benito (Society for Imaging Science and Technology, 2016-01-01)
Aiming at designing a CMOS image sensor that combines high fill factor and focal-plane implementation of instrumental image ...
Article
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Enhanced Sensitivity of CMOS Image Sensors by Stacked Diodes

Leñero Bardallo, Juan Antonio; Delgado Restituto, Manuel; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
We have investigated and compared the performance of photodiodes built with stacked p/n junctions operating in parallel ...
Article
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A Bio-Inspired Vision Sensor With Dual Operation and Readout Modes

Leñero Bardallo, Juan Antonio; Hafliger, Philipp Dominik; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
This paper presents a novel event-based vision sensor with two operation modes: intensity mode and spatial contrast ...
Article
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Compact CMOS active quenching/recharge circuit for SPAD arrays

Vornicu, Ion; Carmona Galán, Ricardo; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Wiley-Blackwell, 2016-01-01)
Avalanche diodes operating in Geiger mode are able to detect single photon events. They can be employed to photon counting ...
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Demo: Image Sensing Scheme Enabling Fully-Programmable Light Adaptation and Tone Mapping with a Single Exposure

Fernández Berni, Jorge; Oliveira, Fernanda D.V.R.; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Association for Computing Machinery, 2016-01-01)
This demo showcases a High Dynamic Range (HDR) technique recently reported. We demonstrate that two intertwined photodiodes ...
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Experimental Evidence of Power Efficiency due to Architecture in Cellular Processor Array Chips

Carmona Galán, Ricardo; Fernández Berni, Jorge; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2016-01-01)
Speeding up algorithm execution can be achieved by increasing the number of processing cores working in parallel. Of course, ...
Final Degree Project
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Aceleración del algoritmo de Viola-Jones mediante rejillas de procesamiento masivamente paralelo en el plano focal

Rodríguez Vázquez, Ángel Benito; Fernández Berni, Jorge; Parra Barrero, Eloy (2015-01-01)
El algoritmo de Viola-Jones es un método de detección de objetos que se usa ampliamente en la detección de caras en imágenes ...
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Live Demonstration: Gaussian Pyramid Extraction with a CMOS Vision Sensor

Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Fernández Berni, Jorge; Carmona Galán, Ricardo; Cabello, D.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2015-01-01)
This live demonstration showcases the Gaussian pyramid with a CMOS vision sensor. The chip features a 176 120 pixel array ...
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A 151 dB high dynamic range CMOS image sensor chip architecture with tone mapping compression embedded in-pixel

Vargas Sierra, Sonia; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2015-01-01)
This paper presents a high dynamic range CMOS image sensor that implements an in-pixel content-aware adaptive global tone ...
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Real-time single-exposure ROI-driven HDR adaptation based on focal-plane reconfiguration

Fernández Berni, Jorge; Carmona Galán, Ricardo; Río Fernández, Rocío del; Kleihorst, R.; Philips, Wilfried; Rodríguez Vázquez, Ángel Benito (Society of Photo-Optical Instrumentation Engineers, 2015-01-01)
This paper describes a prototype smart imager capable of adjusting the photo-integration time of multiple regions of ...
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A high dynamic range image sensor with linear response based on asynchronous event detection

Leñero Bardallo, Juan Antonio; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2015-01-01)
This paper investigates the potential of an image sensor that combines event-based asynchronous outputs with conventional ...
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On the design of a sparsifying dictionary for compressive image feature extraction

Trevisi, Marco; Carmona Galán, Ricardo; Fernández Berni, Jorge; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2015-01-01)
Compressive sensing is an alternative to Nyquist-rate sampling when the signal to be acquired is known to be sparse or ...
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On the calibration of a SPAD-based 3D imager with in-pixel TDC using a time-gated technique

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2015-01-01)
The optical characterization of a CMOS 64×64 single-photon avalanche-diode (SPAD) array with in-pixel 11b time-to-digital ...
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Bottom-up performance analysis of focal-plane mixed-signal hardware for Viola–Jones early vision tasks

Fernández Berni, Jorge; Carmona Galán, Ricardo; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (John Wiley & Sons, 2015-01-01)
Focal-plane mixed-signal arrays have traditionally been designed according to the general claim that moderate accuracy in ...
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Live demonstration: Real-time high dynamic range video acquisition using in-pixel adaptive content-aware tone mapping compression

Vargas Sierra, Sonia; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2015-01-01)
This demonstration targets the acquisition of realtime video sequences involving High Dynamic Range (HDR) scenes. Adaptation ...
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Design considerations for a low-noise CMOS image sensor

González Márquez, Ana; Charlet, Alexandre; Villegas, Alberto; Jiménez Garrido, Francisco José; Medeiro Hidalgo, Fernando; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito (SPIE- The International Society for Optical Engineering, 2015-01-01)
This paper reports a Low-Noise CMOS Image Sensor. Low-noise operation is achieved owing to the combination of a noise-enhanced ...
Article
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A SPAD-based 3D imager with in-pixel TDC for 145ps-accuracy ToF measurement

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (SPIE, 2015-01-01)
The design and measurements of a CMOS 64 × 64 Single-Photon Avalanche-Diode (SPAD) array with in-pixel Time-to-Digital ...
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High dynamic range adaptation for ROI tracking based on reconfigurable concurrent dual-sensing

Fernández Berni, Jorge; Carmona Galán, Ricardo; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institution of Civil Engineers (Great Britain), 2014-01-01)
A single-exposure technique to extend the dynamic range of vision sensors is presented. It is particularly suitable for ...
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A 330μW, 64-channel neural recording sensor with embedded spike feature extraction and auto-calibration

Rodríguez Pérez, Alberto; Delgado Restituto, Manuel; Darie, Ángela; Soto Sánchez, Cristina; Fernández Jover, Eduardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
his paper reports an integrated 64-channel neural recording sensor. Neural signals are acquired, filtered, digitized and ...
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Focal-plane sensing-processing: a power-efficient approach for the implementation of privacy-aware networked visual sensors

Fernández Berni, Jorge; Carmona Galán, Ricardo; Río Fernández, Rocío del; Kleihorst, Richard; Philips, Wilfried; Rodríguez Vázquez, Ángel Benito (MDPI, 2014-01-01)
The capture, processing and distribution of visual information is one of the major challenges for the paradigm of the ...
Article
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A CMOS Imager for Time-of-Flight and Photon Counting Based on Single Photon Avalanche Diodes and In-Pixel Time-to-Digital Converters

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Editura Academiei Române, 2014-01-01)
The design of a CMOS image sensor based on single-photon avalanche-diode (SPAD) array with in-pixel time-to-digital converter ...
Presentation
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Gaussian Pyramid Extraction with a CMOS Vision Sensor

Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Fernández Berni, Jorge; Carmona Galán, Ricardo; Cabello, D.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
This paper addresses a CMOS vision sensor with 176 × 120 pixels in standard 0.18 μm CMOS technology that computes the ...
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A QVGA Vision Sensor with Multi-functional Pixels for Focal-Plane Programmable Obfuscation

Fernández Berni, Jorge; Carmona Galán, Ricardo; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
Privacy awareness constitutes a critical aspect for smart camera networks. An ideal awless protection of sensitive information ...
Presentation
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Review of ADCs for imaging

Leñero Bardallo, Juan Antonio; Fernández Berni, Jorge; Rodríguez Vázquez, Ángel Benito (Society of Photo-Optical Instrumentation Engineers, 2014-01-01)
The aim of this article is to guide image sensors designers to optimize the analog-to-digital conversion of pixel outputs. ...
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A 26.5 nJ/px 2.64 Mpx/s CMOS Vision Sensor for Gaussian Pyramid Extraction

Suárez, Manuel; Fernández Berni, Jorge; Carmona Galán, Ricardo; Cabello, D.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
This paper introduces a CMOS vision sensor to extract the Gaussian pyramid with an energy cost of 26.5 nJ/px at 2.64 Mpx/s, ...
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Smart imaging for power-efficient extraction of Viola-Jones local descriptors

Fernández Berni, Jorge; Carmona Galán, Ricardo; Río Fernández, Rocío del; Leñero Bardallo, Juan Antonio; Suárez Cambre, Manuel; Rodríguez Vázquez, Ángel Benito (Society of Photo-Optical Instrumentation Engineers, 2014-01-01)
In computer vision, local descriptors permit to summarize relevant visual cues through feature vectors. These vectors ...
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Demo: A Prototype Vision Sensor for Real-time Focal-plane Obfuscation through Tunable Pixelation

Fernández Berni, Jorge; Carmona Galán, Ricardo; Río Fernández, Rocío del; Kleihorst, R.; Philips, Wilfried; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
Privacy concerns are hindering the introduction of smart camera networks in prospective application scenarios like retail ...
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Form Factor Improvement of Smart-Pixels for Vision Sensors through 3-D Vertically- Integrated Technologies

Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo; Fernández Berni, Jorge; Vargas Sierra, Sonia; Leñero Bardallo, Juan Antonio; Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Pérez Verdú, Belén (Institute of Electrical and Electronics Engineers, 2014-01-01)
While conventional CMOS active pixel sensors embed only the circuitry required for photo-detection, pixel addressing and ...
Chapter of Book
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Fire detection with a frame-less vision sensor working in the NIR band

Leñero Bardallo, Juan Antonio; Fernández Berni, Jorge; Carmona Galán, Ricardo; Häfliger, Philipp; Rodríguez Vázquez, Ángel Benito (Universidad de Coimbra, 2014-01-01)
This paper draws the attention of the community about the capabilities of an emerging generation of bio-inspired vision ...
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Self-calibration of neural recording sensors

Rodríguez Pérez, Alberto; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
This paper reports a calibration system for automatically adjusting the bandpass and gain characteristics of programmable ...
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In vivo measurements with a 64-channel extracellular neural recording integrated circuit

Delgado Restituto, Manuel; Rodríguez Pérez, Alberto; Darie, Ángela; Rodríguez Vázquez, Ángel Benito; Soto Sánchez, Cristina; Fernández Jover, Eduardo (Institute of Electrical and Electronics Engineers, 2014-01-01)
This paper presents in vivo measurements obtained from an implantable 64-channel neural recording Application Specific ...
Article
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Tunable Low Noise Amplifier Implementation With Low Distortion Pseudo-Resistance for in Vivo Brain Activity Measurement

Kárász, Zoltán; Fiáth, Richard; Földesy, Péter; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
This paper presents a low power neural signal amplifier with tunable cut-off frequencies. The presented compact amplifier, ...
Chapter of Book
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Towards an ultra‐low‐power low‐cost wireless visual sensor node for fine‐grain detection of forest fires

Fernández Berni, Jorge; Carmona Galán, Ricardo; Leñero Bardallo, Juan Antonio; Kleihorst, Richard; Rodríguez Vázquez, Ángel Benito (Universidade de Coimbra, 2014-01-01)
Advances in electronics, sensor technologies, embedded hardware and software are boosting the application scenarios of ...
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Wide range 8ps incremental resolution time interval generator based on FPGA technology

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
Accurate generation of picosecond-resolution wide-range time intervals has become a necessity for the characterization of ...
Article
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Equalization-Based Digital Background Calibration Technique for Pipelined ADCs

Zeinali, Behzad; Moosazadeh, Tohid; Yavari, Mohammad; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
In this paper, we present a digital background calibration technique for pipelined analog-to-digital converters (ADCs). ...
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5×5 SPAD matrices for the study of the trade-offs between fill factor, dark count rate and crosstalk in the design of CMOS image sensors

Moreno García, Manuel; Río Fernández, Rocío del; Guerra Vinuesa, Oscar; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
CMOS Single Photon Avalanche Diodes (SPADs) are a dedicated type of photodetectors that are attracting increasing interest. ...
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A CMOS 0.18μm 64×64 single photon image sensor with in-pixel 11b time-to-digital converter

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2014-01-01)
The design and characterization of a CMOS 64×64 single-photon avalanche-diode (SPAD) array with in-pixel 11b time-to-digital ...
Presentation
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An ultra-low-power voltage-mode asynchronous WTA-LTA circuit

Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2013-01-01)
This paper presents an asynchronous mixed-signal WTA-LTA circuit conceived to carry out local minimummaximum indexing in ...
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A CMOS 8×8 SPAD array for Time-of-Flight measurement and light-spot statistics

Vornicu, Ion; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2013-01-01)
The design and simulation of a CMOS 8 × 8 single photon avalanche diode (SPAD) array is presented. The chip has been ...
Presentation
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A 176x144 148dB adaptive tone-mapping imager

Vargas Sierra, Sonia; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Society of Photo-Optical Instrumentation Engineers, 2012-01-01)
This paper presents a 176x144 (QCIF) HDR image sensor where visual information is simultaneously captured and adaptively ...
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A CMOS-3D reconfigurable architecture with in-pixel processing for feature detectors

Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Pardo, F.; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
This paper introduces a two-tier CMOS-3D architecture for generation of Gaussian pyramids, detection of extrema, and ...
PhD Thesis
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Una Contribución al Diseño de Moduladores Sigma-Delta en Cascada Realizados Mediante Técnicas de Circuito en Tiempo Continuo

Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Tortosa Navas, Ramón (2012-01-01)
Esta tesis doctoral es el resultado de un conjunto de trabajos de investigación encaminados a sistematizar y optimizar el ...
Presentation
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A 148dB focal-plane tone-mapping QCIF imager

Vargas Sierra, Sonia; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
This paper presents a QCIF HDR imager where visual information is simultaneously captured and adaptively compressed by an ...
Article
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Ultralow-power processing array for image enhancement and edge detection

Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
This paper presents a massively parallel processing array designed for the 0.13-μm 1.5-V standard CMOS base process of a ...
Article
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Early forest fire detection by vision-enabled wireless sensor networks

Fernández Berni, Jorge; Carmona Galán, Ricardo; Martínez Carmona, Juan F.; Rodríguez Vázquez, Ángel Benito (CSIRO Publishing, 2012-01-01)
Wireless sensor networks constitute a powerful technology particularly suitable for environmental monitoring. With regard ...
Article
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CMOS-3D smart imager architectures for feature detection

Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Fernández Berni, Jorge; Carmona Galán, Ricardo; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
This paper reports a multi-layered smart image sensor architecture for feature extraction based on detection of interest ...
Article
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An ultralow-power mixed-signal back end for passive sensor UHF RFID transponders

Rodríguez Rodríguez, José Antonio; Delgado Restituto, Manuel; Masuch, Jens; Rodríguez Pérez, Alberto; Alarcon Cot, Eduard; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
This paper describes the design of mixed-signal back end for an ultrahigh-frequency sensor-enabled radio-frequency ...
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A 64-channel inductively-powered neural recording sensor array

Rodríguez Pérez, Alberto; Masuch, Jens; Rodríguez Rodríguez, José Antonio; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
This paper reports a 64-channel inductively powered neural recording sensor array. Neural signals are acquired, filtered, ...
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High-speed global shutter CMOS machine vision sensor with high dynamic range image acquisition and embedded intelligence

Jiménez Garrido, Francisco José; Fernández Pérez, José María; Utrera, Cayetana; Muñoz, José María; Pardo, María Dolores; Giulietti, Alexander; Domínguez Castro, Rafael; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (The International Society for Optics and Photonics, 2012-01-01)
High-speed imagers are required for industrial applications, traffic monitoring, robotics and unmanned vehicles, moviemaking, ...
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In-pixel generation of gaussian pyramid images by block reusing in 3D-CMOS

Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Cabello, D.; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
This paper introduces an architecture of a switched-capacitor network for Gaussian pyramid generation. Gaussian pyramids ...
Presentation
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Control and acquisition system for a high dynamic range CMOS image sensor

Vargas Sierra, Sonia; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
A control and acquisition system for the visualization of the images captured with a High Dynamic Range (HDR) CMOS Image ...
Presentation
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Real-time remote reporting of motion analysis with Wi-Flip

Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
This paper describes a real-time application programmed into Wi-FLIP, a wireless smart camera resulting from the integration ...
Article
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A Low-Power Programmable Neural Spike Detection Channel With Embedded Calibration and Data Compression

Rodríguez Pérez, Alberto; Ruiz Amaya, Jesús; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
This paper reports a programmable 400 μm pitch neural spike recording channel, fabricated in a 130 nm standard CMOS ...
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CMOS SPADs selection, modeling and characterization towards image sensors implementation

Moreno García, Manuel; Guerra Vinuesa, Oscar; Río Fernández, Rocío del; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
The selection, modeling and characterization of Single Photon Avalanche Diodes (SPADs) are presented. Working with the ...
Presentation
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Power-efficient focal-plane image representation for extraction of enriched Viola-Jones features

Fernández Berni, Jorge; Acasandrei, Laurentiu; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2012-01-01)
This paper describes the use of a reconfigurable focal-plane processing array in order to achieve an image representation ...
Chapter of Book
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VISCUBE: A multi-layer vision chip

Zarandy, Akos; Zarandy, Akos; Rekeczky, Csaba; Földesy, P.; Carmona Galán, Ricardo; Liñán Cembrano, Gustavo; Gergely, S.; Rodríguez Vázquez, Ángel Benito; Roska, Tamás (Springer Science+Business Media, 2011-01-01)
Vertically integrated focal-plane sensor-processor chip design, combining image sensor with mixed-signal and digital ...
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A QCIF 145dB imager for focal plane processor chips using a tone mapping technique in standard 0.35μm CMOS technology

Vargas Sierra, Sonia; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (2011-01-01)
This paper presents a QCIF HDR imager where visual information is simultaneously captured and adaptively compressed by ...
Presentation
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Switched-capacitor networks for scale-space generation

Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Cabello, D.; Pozas Flores, Francisco; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2011-01-01)
In scale-space filtering signals are represented at several scales, each conveying different details of the original signal. ...
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High-dynamic range tone-mapping algorithm for focal plane processors

Vargas Sierra, Sonia; Liñán Cembrano, Gustavo; Roca Moreno, Elisenda; Rodríguez Vázquez, Ángel Benito (The International Society for Optics and Photonics, 2011-01-01)
This paper presents a Dynamic Range improvement technique which is specially well-suited to be implemented in Focal Plane ...
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Multi-resolution low-power Gaussian filtering by reconfigurable focal-plane binning

Fernández Berni, Jorge; Carmona Galán, Ricardo; Pozas Flores, Francisco; Zarandy, A.; Rodríguez Vázquez, Ángel Benito (The International Society for Optics and Photonics, 2011-01-01)
Gaussian filtering is a basic tool for image processing. Noise reduction, scale-space generation or edge detection are ...
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Focal-plane generation of multi-resolution and multi-scale image representation for low-power vision applications

Fernández Berni, Jorge; Carmona Galán, Ricardo; Carranza González, Luis; Zarandy, A.; Rodríguez Vázquez, Ángel Benito (The International Society for Optics and Photonics, 2011-01-01)
Early vision stages represent a considerably heavy computational load. A huge amount of data needs to be processed under ...
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A power efficient neural spike recording channel with data bandwidth reduction

Rodríguez Pérez, Alberto; Ruiz Amaya, Jesús; Rodríguez Rodríguez, José Antonio; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2011-01-01)
This paper presents a mixed-signal neural spike recording channel which features, as an added value, a simple and low-power ...
Presentation
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Design of a smart SiPM based on focal-plane processing elements for improved spatial resolution in PET

Pozas Flores, Francisco; Carmona Galán, Ricardo; Fernández Berni, Jorge; Rodríguez Vázquez, Ángel Benito (The International Society for Optics and Photonics, 2011-01-01)
Single-photon avalanche diodes are compatible with standard CMOS. It means that photo-multipliers for scintillation detectors ...
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Wi-FLIP: A wireless smart camera based on a focal-plane low-power image processor

Fernández Berni, Jorge; Carmona Galán, Ricardo; Liñán Cembrano, Gustavo; Zarandy, A.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2011-01-01)
This paper presents Wi-FLIP, a vision-enabled WSN node resulting from the integration of FLIP-Q, a prototype vision chip, ...
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An auto-calibrated neural spike recording channel with feature extraction capabilities

Rodríguez Pérez, Alberto; Ruiz Amaya, Jesús; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (The International Society for Optics and Photonics, 2011-01-01)
This paper presents a power efficient architecture for a neural spike recording channel. The channel offers a selfcalibration ...
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A self-calibration circuit for a neural spike recording channel

Rodríguez Pérez, Alberto; Ruiz Amaya, Jesús; Delgado Restituto, Manuel; Sawan, Mohamad; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2011-01-01)
This paper presents a self-calibration circuit for a neural spike recording channel. The proposed design tunes the bandwidth ...
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Image filtering by reduced kernels exploiting kernel structure and focal-plane averaging

Fernández Berni, Jorge; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2011-01-01)
Incorporating multi-resolution capabilities into imagers renders additional power saving mechanisms in the subsequent image ...
Chapter of Book
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A focal plane processor for continuous-time 1-D optical correlation applications

Liñán Cembrano, Gustavo; Carranza González, Luis; Alexandre, B.; Rodríguez Vázquez, Ángel Benito; Fuente, Pablo de la; Morlanes, Tomás (Springer, 2011-01-01)
This chapter describes a 1-D Focal Plane Processor, which has been designed to run continuous-time optical correlation ...
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Transistor-Level Synthesis of Pipeline Analog-to-Digital Converters Using a Design-Space Reduction Algorithm

Ruiz Amaya, Jesús; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2011-01-01)
A novel transistor-level synthesis procedure for pipeline ADCs is presented. This procedure is able to directly map ...
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Demo: Real-time remote reporting of active regions with Wi-FLIP

Fernández Berni, Jorge; Carmona Galán, Ricardo; Liñán Cembrano, Gustavo; Zarandy, A.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2011-01-01)
This paper describes a real-time application programmed into Wi-FLIP, a wireless smart camera resulting from the integration ...
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Introduction to the special issue on the 36th European Solid-State Circuits Conference (ESSCIRC)

Rodríguez Vázquez, Ángel Benito; Leenaerts, Domine M. W.; Pineda de Gyvez, José (Institute of Electrical and Electronics Engineers, 2011-01-01)
The 22 papers in this special issue were originally presented at the 2010 European Solid-State Circuits Conference (ESSCIRC). ...
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A CMOS vision system on-chip with multicore sensory processing ar- chitecture for image analysis above 1,000F/s

Rodríguez Vázquez, Ángel Benito; Castro, Rafael; Jiménez Garrido, Francisco José; Morillas, Sergio (Spie, 2010-01-01)
This paper describes a Vision-System-on-Chip (VSoC) capable of doing: image acquisition, image processing through on-chip ...
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A FPP-oriented tone mapping technique for high dynamic range imagers using temporal and final exposure measurements

Vargas Sierra, Sonia; Liñán Cembrano, Gustavo; Roca Moreno, Elisenda; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2010-01-01)
This paper presents a Dynamic Range improvement technique which is specially well-suited to be implemented in Focal Plane ...
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Offset-compensated comparator with full-input range in 150nm FDSOI CMOS-3d technology

Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Domínguez Matas, Carlos; Carmona Galán, Ricardo; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2010-01-01)
This paper addresses an offset-compensated comparator with full-input range in the 150nm FDSOI CMOS- 3D technology from ...
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On-site forest fire smoke detection by low-power autonomous vision sensor

Fernández Berni, Jorge; Carmona Galán, Ricardo; Carranza González, Luis; Cano Rojas, Alberto; Martínez Carmona, Juan F.; Rodríguez Vázquez, Ángel Benito; Morillas Castillo, Sergio (2010-01-01)
Early detection plays a crucial role to prevent forest fires from spreading. Wireless vision sensor networks deployed ...
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Simplified state update calculation for fast and accurate digital emulation of CNN dynamics

Pozas Flores, Francisco; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2010-01-01)
Compared to other one-step integration methods, the 4th-order Runge-Kutta is much more accurate while still consisting in ...
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Transformer based front-end for a low power 2.4 GHz transceiver

Masuch, Jens; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2010-01-01)
A low power transceiver architecture for the 2.4 GHz ISM band using a 1.0 V supply is presented. It employs a transformer ...
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A 3-D Chip Architecture for Optical Sensing and Concurrent Processing

Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo; Domínguez Matas, Carlos; Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Pozas, Francisco; Liñán Cembrano, Gustavo; Foldessy, Peter; Zarandy, Akos; Rekeczky, Csaba (SPIE, 2010-01-01)
This paper presents an architecture for the implementation of vision chips in 3-D integration technologies. This ...
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In-pixel ADC for a vision architecture on CMOS-3D technology

Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Domínguez Matas, Carlos; Carmona Galán, Ricardo; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2010-01-01)
This paper addresses the design of an 8-bit single-slope in-pixel ADC for a 3D chip architecture intended for airborne ...
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Baseband-processor for a passive UHF RFID transponder

Rodríguez Rodríguez, José Antonio; Delgado Restituto, Manuel ; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2010-01-01)
This paper describes the design of a digital processor targeting the Class-1 Generation-2 EPC Protocol for UHF RFID ...
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Digital processor array implementation aspects of a 3D multi-layer vision architecture

Földesy, Peter; Carmona Galán, Ricardo; Rekeczky, Csaba; Zarandy, A.; Rodríguez Vázquez, Ángel Benito; Roska, Tamás (Institute of Electrical and Electronics Engineers, 2010-01-01)
Technological aspects of the 3D integration of a multilayer combined mixed-signal and digital sensor-processor array chip ...
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A prototype node for wireless vision sensor network applications development

Bakkali, M.; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2010-01-01)
This paper presents a prototype vision-enabled sensor node based on a commercial vision system of reduced size and power ...
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ECCTD 2007 special issue 'bridging technology innovations to foundations'

Delgado Restituto, Manuel ; Alarcón, Eduard; Rodríguez Vázquez, Ángel Benito (Wiley-Blackwell, 2009-01-01)
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A low-power reconfigurable ADC for biomedical sensor interfaces

Rodríguez Pérez, Alberto; Delgado Restituto, Manuel; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2009-01-01)
This paper presents a 12-bit low-voltage low-power reconfigurable Analog-to-Digital Converter (ADC). The design employs ...
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Accurate Settling-Time Modeling and Design Procedures for Two-Stage Miller-Compensated Amplifiers for Switched-Capacitor Circuits

Ruiz Amaya, Jesús; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2009-01-01)
We present modeling techniques for accurate estimation of settling errors in switched-capacitor (SC) circuits built with ...
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Integrated Circuitry to Detect Slippage Inspired by Human Skin and Artificial Retinas

Maldonado López, Rocío; Vidal Verdú, Fernando; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2009-01-01)
This paper presents a bioinspired integrated tactile coprocessor that is able to generate a warning in the case of slippage ...
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3D multi-layer vision architecture for surveillance and reconnaissance applications

Földesy, Péter; Carmona Galán, Ricardo; Zarandy, A.; Rekeczky, Csaba; Rodríguez Vázquez, Ángel Benito; Roska, Tamás (Institute of Electrical and Electronics Engineers, 2009-01-01)
The architecture and the design details of a multilayer combined mixed-signal and digital sensor-processor array chip is ...
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Systematic design of high-resolution high-frequency cascade continuous-time sigma-delta modulators

Tortosa Navas, Ramón; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal; Rosa Utrera, José Manuel de la; Roca Moreno, Elisenda; Castro López, Rafael (2008-01-01)
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Insect-vision inspired collision warning vision processor for automobiles

Liñán Cembrano, Gustavo; Carranza González, Luis; Rind, Claire; Zarandy, Akos; Soininen, Martti; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2008-01-01)
Vision is expected to play important roles for car safety enhancement. Imaging systems can be used to enlarging the vision ...
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La simulación eléctrica en el trabajo académicamente dirigido como vehículo docente para la enseñanza de la electrónica

Acosta Jiménez, Antonio José; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (2008-01-01)
La Electrónica es una disciplina versátil en cuanto a las metodologías y técnicas docentes que pueden emplearse. Frente a ...
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Matrix Methods for the Dynamic Range Optimization of Continuous-TimeGm-CFilters

Fernández Bootello, Juan Francisco; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2008-01-01)
This paper presents a synthesis procedure for the optimization of the dynamic range of continuous-time fully differential ...
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Electrical-level synthesis of pipeline ADCs

Ruiz Amaya, Jesús; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2008-01-01)
This paper presents a design tool for the synthesis of pipeline ADCs which is able to optimally map high-level converter ...
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CMOS Architectures and circuits for high-speed decision-making from image flows

Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Jiménez Garrido, Francisco José; Morillas Castillo, Sergio; Listán, Juan; Alba, Luis; Utrera, Cayetana; Romay Juárez, Rafael; Medeiro Hidalgo, Fernando (The International Society for Optical Engineering (SPIE), 2008-01-01)
We present architectures, CMOS circuits and CMOS chips to process image flows at very high speed. This is achieved by ...
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A Focal-Plane Image Processor for Low Power Adaptive Capture and Analysis of the Visual Stimulus

Domínguez Matas, Carlos; Carmona Galán, Ricardo; Sánchez Fernández, Francisco J.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2007-01-01)
Portable applications of artificial vision are limited by the fact that conventional processing schemes fail to meet the ...
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A 5.3mW, 2.4GHz ESD protected Low-Noise Amplifier in a 0.13μm RFCMOS technology

Brandano, Davide; Delgado Restituto, Manuel; Ruiz Amaya, Jesús; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2007-01-01)
An Electrostatic Discharge (ESD) protected Low- Noise Amplifier (LNA) for the 2.4 GHz ISM band designed in a 0.13 mum ...
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Accurate and simple modeling of amplifier dc gain nonlinearity in switched-capacitor circuits

Yavari, Mohammad; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2007-01-01)
This paper presents an accurate and simple model for dc gain nonlinearity of operational amplifiers used in the ...
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Integrated circuit interface for artificial skins

Maldonado López, Rocío; Vidal Verdú, Fernando; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (SPIE Europe, 2007-01-01)
Artificial sensitive skins are intended to emulate the human skin to improve the skills of robots and machinery in complex ...
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A design tool for high-resolution high-frequency cascade continuous- time Σ∆ modulators

Tortosa Navas, Ramón; Castro López, Rafael; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (SPIE, 2007-01-01)
This paper introduces a CAD methodology to assist the de signer in the implementation of continuous-time (CT) cas- cade ...
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A 12-bit@40MS/s Gm-C Cascade 3-2 Continuous-Time Sigma-Delta Modulator

Tortosa Navas, Ramón; Aceituno, Antonio; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (Institute of Electrical and Electronics Engineers, 2007-01-01)
This paper reports the transistor-level design of a 130-nm CMOS continuous-time cascade ΣΔ modulator. The modulator topology, ...
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Comparison of the DR of continuous time Gm-C filters using different structures

Fernández Bootello, Juan Francisco; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito; Brandano, Davide (World Scientific and Engineering Academy and Society, 2006-01-01)
This paper presents design techniques to evaluate the noise and distortion of continuous time Gm-C filters. Also presents ...
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A new high-level synthesis methodology of cascaded continuous-time ΣΔ modulators

Tortosa Navas, Ramón; Rosa Utrera, José Manuel de la; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2006-01-01)
This brief presents an efficient method for synthesizing cascaded sigma–delta modulators implemented with continuous-time ...
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Robust symmetric multiplication for programmable analog VLSI array processing

Domínguez Matas, Carlos; Carmona Galán, Ricardo; Sánchez Fernández, Francisco J.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2006-01-01)
This paper presents an electrically programmable analog multiplier. The circuit performs the multiplication between an ...
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Tactile retina for slip detection

Maldonado López, Rocío; Vidal Verdú, Fernando; Liñán Cembrano, Gustavo; Roca Moreno, Elisenda; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2006-01-01)
The interest in tactile sensors is increasing as their use in complex unstructured environments is demanded, like in ...
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3-Layer CNN Chip for Focal-Plane Complex Dynamics with Adaptive Image Capture

Domínguez Matas, Carlos; Carmona Galán, Ricardo; Sánchez Fernández, Francisco J.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2006-01-01)
This paper presents a CMOS implementation of a layered CNN concurrent with 32times32 photosensors with locally programmable ...
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Bio-inspired 0.35μm CMOS Time-to-Digital Converter with 29.3ps LSB

Mozsary, Andras; Rodríguez Vázquez, Ángel Benito; Chung, Jen-Feng; Roska, Tamás (Institute of Electrical and Electronics Engineers, 2006-01-01)
Time-to-digital converter (TDC) integrated circuit is introduced in this paper. It is based on chain of delay elements ...
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Locust-inspired vision system on chip architecture for collision detection in automotive applications

Carranza González, Luis; Laviana, Rubén; Vargas Sierra, Sonia; Cuadri Carvajo, Jorge; Liñán Cembrano, Gustavo; Roca Moreno, Elisenda; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2006-01-01)
This paper describes a programmable digital computing architecture dedicated to process information in accordance to the ...
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Double-sampled cascaded sigma-delta modulator topologies for low oversampling ratios

Yavari, Mohammad; Shoaei, Omid; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2006-01-01)
This paper presents novel double-sampling cascaded sigma-delta modulator topologies for wideband applications. The proposed ...
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Double-Sampling Single-Loop EA Modulator Topologies for Broad-band Applications

Yavari, Mohammad; Shoaei, Omid; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2006-01-01)
This paper presents novel double sampling high-order single loop sigma-delta modulator structures for wide-band applications. ...
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Design of a 1.2-V 130nm CMOS 13-bit@40MS/s Cascade 2-2-1 Continuous-Time ΣΔ Modulator

Tortosa Navas, Ramón; Aceituno Marchena, Antonio; Rosa Utrera, José Manuel de la; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2006-01-01)
This paper presents the design of a continuous- time multibit cascade 2-2-1 ΣΔ modulator for broadband telecom systems. ...
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Reconfiguration of Cascade ΣΔ Modulators for Multistandard GSM/Bluetooth/UIMTS/WLAN Transceivers

Morgado García de la Polavieja, Alonso; Río Fernández, Rocío del; Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2006-01-01)
This paper presents design considerations for cascade Sigma-Delta Modulators (ΣΔMs) included in multi-standard wireless ...
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Design of a 1.2-V Cascade Continuous-Time Sigma-Delta Modulator for Broadband Telecommunications

Tortosa Navas, Ramón; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (Institute of Electrical and Electronics Engineers, 2006-01-01)
This paper presents the design of a continuous-time multibit cascade 2-2-1 sigma-delta modulator for broadband telecom systems.
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Design Considerations for Multistandard Cascade ΣΔ Modulators

Morgado García de la Polavieja, Alonso; Río Fernández, Rocío del; Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (2005-01-01)
This paper discusses design considerations for cascade Sigma-Delta Modulators (ΣΔMs) included in multistandard wireless ...
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A CMOS 110-dB@40-kS/s programmable-gain chopper-stabilized third-order 2-1 cascade sigma-selta modulator for low-power high-linearity automotive aensor ASICs

Rosa Utrera, José Manuel de la; Escalera Morón, Sara; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Guerra Vinuesa, Oscar; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2005-01-01)
This paper describes a 0.35-μm CMOS chopper-stabilized switched-capacitor 2-1 cascade ΣΔ modulator for automotive sensor ...
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High-level synthesis of switched-capacitor, switched-current and continuous-time ΣΔ modulators using SIMULINK-based time-domain behavioral models

Ruiz Amaya, Jesús; Rosa Utrera, José Manuel de la; Fernández Fernández, Francisco Vidal; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2005-01-01)
This paper presents a high-level synthesis tool for ΣΔ Modulators (ΣΔMs) that combines an accurate SIMULINK-based time-domain ...
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Macromodelling for analog design and robustness boosting in bio-inspired computing models

Cuadri Carvajo, Jorge; Liñán Cembrano, Gustavo; Roca Moreno, Elisenda; Rodríguez Vázquez, Ángel Benito (Society of Photo-Optical Instrumentation Engineers, 2005-01-01)
Setting specifications for the electronic implementation of biological neural-network-like vision systems on-chip is not ...
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Effect of Clock Jitter Error on the Performance Degradation of Multi-bit Continuous-Time ΣΔ Modulators With NRZ DAC

Tortosa Navas, Ramón; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (2005-01-01)
This paper analyses the effect of the clock jitter error in multi-bit continuous-time ΣΔ modulators with non-return-to-zero ...
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A 0.18μm CMOS low-noise elliptic low-pass continuous-time filter

Fernández Bootello, Juan Francisco; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2005-01-01)
This paper presents a seventh order low-pass continuous-time elliptic filter for use in a high-performance wireline ...
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An Embedded 12-bit 80MS/s A/D/A Interface for Power-Line Communications in 0.13μm Pure Digital CMOS Technology

Delgado Restituto, Manuel; Ruiz Amaya, Jesús; Rosa Utrera, José Manuel de la; Fernández Bootello, Juan Francisco; Díez Villar, Leila; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2005-01-01)
This paper presents an embedded interface, comprising both A/D and D/A converters, which has been implemented in a 0.13μm ...
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On the suitability and development of layout templates for analog layout reuse and layout-aware synthesis

Castro López, Rafael; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2005-01-01)
Accelerating the synthesis of increasingly complex analog integrated circuits is key to bridge the widening gap between ...
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Simulation-based high-level synthesis of Nyquist-rate data converters using MATLAB/SIMULINK

Ruiz Amaya, Jesús; Rosa Utrera, José Manuel de la; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2005-01-01)
This paper presents a toolbox for the simulation, optimization and high-level synthesis of Nyquist-rate Analog-to-Digital ...
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A Reuse-based framework for the design of analog and mixed-signal ICs

Castro López, Rafael; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering -SPIE, 2005-01-01)
Despite the spectacular breakthroughs of the semiconductor industry, the ability to design integrated circuits (ICs) under ...
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A 0.18 μm CMOS low noise, highly linear continuous-time seventh-order elliptic low-pass filter

Fernández Bootello, Juan Francisco; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering- SPIE, 2005-01-01)
This paper presents a fast procedure for the system-level evaluation of noise and distortion in continuous-time integrated ...
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Tactile on-chip pre-processing with techniques from artificial retinas

Maldonado López, Rocío; Vidal Verdú, Fernando; Liñán Cembrano, Gustavo; Roca Moreno, Elisenda; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2005-01-01)
The interest in tactile sensors is increasing as their use in complex unstructured environments is demanded, like in ...
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Geometrically-constrained, parasitic-aware synthesis of analog ICs

Castro López, Rafael; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2005-01-01)
In order to speed up the design process of analog ICs, iterations between different design stages should be avoided as ...
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Continuous-time cascaded ΣΔ modulators for VDSL: A comparative study

Tortosa Navas, Ramón; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (The International Society for Optical Engineering - SPIE, 2005-01-01)
This paper describes new cascaded continuous-time ΣΔ modulators intended to cope with very high-rate digital subscriber ...
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ACE 16k based stand-alone system for real-time pre-processing tasks

Carranza González, Luis; Jiménez Garrido, Francisco José; Liñán Cembrano, Gustavo; Roca Moreno, Elisenda; Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2005-01-01)
This paper describes the design of a programmable stand-alone system for real time vision pre-processing tasks. The system's ...
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A mixed-signal integrated circuit for FM-DCSK modulation

Delgado Restituto, Manuel; Acosta Jiménez, Antonio José; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2005-01-01)
This paper presents a mixed-signal application-specific integrated circuit (ASIC) for a frequency-modulated differential ...
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Behavioral Modeling, Simulation and High-Level Synthesis of Pipeline A/D Converters

Ruiz Amaya, Jesús; Rosa Utrera, José Manuel de la; Delgado Restituto, Manuel ; Rodríguez Vázquez, Ángel Benito (2005-01-01)
This paper presents a MATLAB® toolbox for the time-domain simulation and high-level sizing of pipeline analog-to-digital ...
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A Direct Synthesis Method of Cascaded Continuous-Time Sigma-Delta Modulators

Tortosa Navas, Ramón; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (2005-01-01)
This paper presents an efficient method to synthesize cascaded sigma-delta modulators implemented with continuous-time ...
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Analysis of Clock Jitter Error in Multibit Continuous-Time ΣΔ modulators with NRZ Feedback Waveform

Tortosa Navas, Ramón; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (Institute of Electrical and Electronics Engineers, 2005-01-01)
This paper presents a detailed study of the clock jitter error in multibit continuous-time ΣΔ modulators with non-return-to-zero ...
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A 0.35 μm CMOS 17-bit@40-kS/s cascade 2-1 ΣΔ modulator with programmable gain and programmable chopper stabilization

Guerra Vinuesa, Oscar; Escalera Morón, Sara; Rosa Utrera, José Manuel de la; Río Fernández, Rocío del; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2005-01-01)
This paper describes a 0.35μm CMOS chopper-stabilized Switched-Capacitor 2-1 cascade ΣDelta; modulator for automotive ...
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A 1000 FPS at 128×128 vision processor with 8-bit digitized I/O

Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo; Jiménez Garrido, Francisco José; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael (Institute of Electrical and Electronics Engineers, 2004-01-01)
This paper presents a mixed-signal programmable chip for high-speed vision applications. It consists of an array of ...
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Reaction-diffusion navigation robot control: from chemical to VLSI analogic processors

Adamatzky, Andrew; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2004-01-01)
We introduce a new methodology and experimental implementations for real-time wave-based robot navigation in a complex, ...
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Analysis of error mechanisms in switched-current Sigma-Delta modulators

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Springer, 2004-01-01)
This paper presents a systematic analysis of the major switched-current (SI) errors and their influence on the performance ...
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ACE16K: The Third Generation of Mixed-Signal SIMD-CNN ACE Chips Toward VSoCs

Rodríguez Vázquez, Ángel Benito; Liñán Cembrano, Gustavo; Carranza González, Luis; Roca Moreno, Elisenda; Carmona Galán, Ricardo; Jiménez Garrido, Francisco José; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos (Institute of Electrical and Electronics Engineers, 2004-01-01)
Today, with 0.18-μm technologies mature and stable enough for mixed-signal design with a large variety of CMOS compatible ...
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Highly Linear 2,5-V CMOS ΣΔ Modulator for ADSL+

Río Fernández, Rocío del; Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Delgado Restituto, Manuel; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2004-01-01)
We present a 90-dB spurious-free dynamic range sigma–delta modulator (ΣΔM) for asymmetric digital subscriber line applications ...
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Second-order neural core for bioinspired focal-plane dynamic image processing in CMOS

Carmona Galán, Ricardo; Jiménez Garrido, Francisco José; Domínguez Matas, Carlos; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Petrás, István; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2004-01-01)
Based on studies of the mammalian retina, a bioinspired model for mixed-signal array processing has been implemented on ...
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A 0.35μm CMOS 17-bit@40kS/s Sensor A/D Interface Based on a Programmable-Gain Cascade 2-1 ΣΔ Modulator

García González, José Manuel; Escalera Morón, Sara; Rosa Utrera, José Manuel de la; Guerra Vinuesa, Oscar; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2004-01-01)
This paper describes the design and electrical implementation of an A/D interface for sensor applications realized in a ...
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A CNN-driven locally adaptive CMOS image sensor

Carmona Galán, Ricardo; Domínguez Matas, Carlos; Cuadri, J.; Jiménez Garrido, Francisco José; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2004-01-01)
A bioinspired model for mixed-signal array mimics the way in which images are processed in the visual pathway. Focal-plane ...
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An Optimization-based Tool for the High-Level Synthesis of Discrete-time and continuous-Time Sigma-Delta Modulators in the MATLAB/SIMULINK Environment

Ruiz Amaya, Jesús; Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Fernández Fernández, Francisco Vidal; Río Fernández, Rocío del; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2004-01-01)
This paper presents a MATLAB toolbox for the automated high-level sizing of ΣΔ Modulators (ΣΔMs) based on the combination ...
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MATLAB/SIMULINK-Based High-Level Synthesis of Discrete-Time and Continuous-Time Sigma-Delta Modulators

Ruiz Amaya, Jesús; Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Fernández Fernández, Francisco Vidal; Río Fernández, Rocío del; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2004-01-01)
This paper describes a tool that combines an accurate SIMULINK-based time-domain behavioural simulator with a statistical ...
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An Alternative DfT Methodology to Test High-Resolution ΣΔ Modulators

Escalera Morón, Sara; García González, José Manuel; Guerra Vinuesa, Oscar; Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2004-01-01)
In this paper, a novel DfT methodology to test high-resolution ΣΔ Modulators (ΣΔM) is introduced. The aim of the proposal ...
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Towards a computational approach for collision avoidance with real-world scenes

Keil, Matthias Sven; Rodríguez Vázquez, Ángel Benito (SPIE- The International Society for Optical Engineering, 2003-01-01)
In the central nervous systems of animals like pigeons and locusts, neurons were identified which signal objects approaching ...
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A Bio-Inspired Two-Layer Mixed-Signal Flexible Programmable Chip for Early Vision

Carmona Galán, Ricardo; Jiménez Garrido, Francisco José; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Roska, Tamás; Rekeczky, Csaba; Petrás, István; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2003-01-01)
A bio-inspired model for an analog programmable array processor (APAP), based on studies on the vertebrate retina, has ...
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Exploration of spatial-temporal dynamic phenomena in a 32×32-cell stored program two-layer CNN universal machine chip prototype

Petrás, István; Rekeczky, Csaba; Roska, Tamás; Carmona Galán, Ricardo; Jiménez Garrido, Francisco José; Rodríguez Vázquez, Ángel Benito (World Scientific Publishing, 2003-01-01)
This paper describes a full-custom mixed-signal chip that embeds digitally programmable analog parallel processing and ...
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Expandible high-order cascade ya modulator with constant, reduced systematic loss of resolution

Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2003-01-01)
An arbitrary order sigma-delta modulator cascude architecture is presented with only I-bit loss of resolution due to scaling ...
Chapter of Book
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BandPass Sigma-Delta Analog-to-Digital Converters

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Springer, 2003-01-01)
The principle of ΣΔ Modulation (ΣΔM) is extended in BPΣΔMs to bandpass signals, especially but not only, with a narrow ...
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Analog weight buffering strategy for CNN chips

Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael (Institute of Electrical and Electronics Engineers, 2003-01-01)
Large, gray-scale CNN chips employ analog signals to achieve high-density in the internal distribution of the template ...
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A SIMULINK-based approach for fast and precise simulation of switched-capacitor, switched-current and continuous-time /spl Sigma//spl Delta/ modulators

Moreno Reina, Javier; Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Romay, Rafael; Río Fernández, Rocío del; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2003-01-01)
This paper describes how to extend the capabilities of SIMULINK for the time-domain simulation of /spl Sigma//spl Delta/ ...
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System-level optimization of baseband filters for communication applications

Fernández Bootello, Juan Francisco; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2003-01-01)
In this paper, a design approach for the high-level synthesis of programmable continuous-time baseband filters able to ...
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CMOS mixed-signal MODEM for data transmission and control of electrical household appliances using the low-voltage power-line

Escalera Morón, Sara; Domínguez Matas, Carlos; García González, José Manuel; Guerra Vinuesa, Oscar; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2003-01-01)
This paper presents a CMOS 0.6μm mixed-signal MODEM ASIC for data transmission using the low-voltage power line. This ...
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A versatile sensor interface for programmable vision systems-on-chip

Rodríguez Vázquez, Ángel Benito; Liñán Cembrano, Gustavo; Roca Moreno, Elisenda; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael (The International Society for Optical Engineering - SPIE, 2003-01-01)
This paper describes an optical sensor interface designed for a programmable mixed-signal vision chip. This chip has been ...
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On the development of a MODEM for data transmission and control of electrical household appliances using the low-voltage power-line

Escalera Morón, Sara; Domínguez Matas, Carlos; García González, José Manuel; Guerra Vinuesa, Oscar; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2003-01-01)
This paper presents a CMOS 0,6μm mixed-signal MODEM ASIC for data transmission on the low-voltage power line. The circuit ...
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A mixed-signal early vision chip with embedded image and programming memories and digital I/O

Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos (The International Society for Optical Engineering - SPIE, 2003-01-01)
From a system level perspective, this paper presents a 128 × 128 flexible and reconfigurable Focal-Plane Analog Programmable ...
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A ΣΔ modulator for a programmable-gain, low-power, high-linearity automotive sensor interface

Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2003-01-01)
This paper describes the design and electrical implementation of a 0.35μm CMOS 17-bit≰0kS/s Sigma-Delta Modulator (ΣΔM) ...
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Programmable retinal dynamics in a CMOS mixed-signal array processor chip

Carmona Galán, Ricardo; Jiménez Garrido, Francisco José; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2003-01-01)
The low-level image processing that takes place in the retina is intended to compress the relevant visual information to ...
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Neuro-fuzzy chip to handle complex tasks with analog performance

Navas González, Rafael; Rodríguez Vázquez, Ángel Benito; Vidal Verdú, Fernando (Institute of Electrical and Electronics Engineers (IEEE), 2003-01-01)
This Paper presents a mixed-signal neuro-fuzzy controller chip which, in terms of power consumption, input-output delay ...
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Design Considerations for an Automotive Sensor Interface Sigma-Delta Modulator

Medeiro Hidalgo, Fernando; Rosa Utrera, José Manuel de la; Río Fernández, Rocío del; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2003-01-01)
The Sigma-Delta Modulator presented in this paper contains a programmable-gain input inferface to accommodate the output ...
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A 2.5-V CMOS Wideband Sigma-Delta Modulator

Río Fernández, Rocío del; Medeiro Hidalgo, Fernando; Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2003-01-01)
A high-performance Sigma-Delta modulator for wireline communication applications is presenfed It employs a 4th-order cascade ...
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Accurate VHDL-based simulation of Sigma Delta modulators

Castro López, Rafael; Fernández Fernández, Francisco Vidal; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2003-01-01)
The computational cost of transient simulation of /spl Sigma//spl Delta/ modulators (/spl Sigma//spl Delta/Ms) at the ...
PhD Thesis
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Análisis y diseño de hardware VLSI basado en CNNs para el procesamiento de imágenes en tiempo-real

Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo (2002-06-10)
Durante las últimas décadas del siglo XX hemos asistido a dos oleadas revolucionarias sucesivas en el ámbito del tratamiento ...
PhD Thesis
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Diseño de chips programables de señal mixta con bajo consumo de potencia para sistemas de visión en tiempo real

Rodríguez Vázquez, Ángel Benito; Liñán Cembrano, Gustavo (2002-01-01)
Las Tecnologías de la información y de las Comunicaciones han progresado de forma vertiginosa durante los últimos años. ...
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Integrated chaos generators

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2002-01-01)
This paper surveys the different design issues, from mathematical model to silicon, involved on the design of integrated circuits for the generation of chaotic behavior.
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Toward visual microprocessors

Roska, Tamás; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2002-01-01)
This paper outlines motivations and models underlying the design of visual microprocessors based on the cellular neural ...
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Generation of technology-portable flexible analog blocks

Castro López, Rafael; Fernández Fernández, Francisco Vidal; Delgado Restituto, Manuel; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2002-01-01)
This paper introduces a complete methodology for retargeting of analog blocks to different sets of specifications, even ...
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A multimode gray-scale CMOS optical sensor for visual computers

Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Roca Moreno, Elisenda (Institute of Electrical and Electronics Engineers, 2002-01-01)
This paper presents a new multimode optical sensor architecture for the optical interface of Visual CNN (cellular neural ...
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Mismatch-induced tradeoffs and scalability of mixed-signal vision chips

Rodríguez Vázquez, Ángel Benito; Liñán Cembrano, Gustavo; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael (Institute of Electrical and Electronics Engineers, 2002-01-01)
This paper explores different trade-offs associated with the design of analog VLSI chips. These trade-offs are related to ...
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CMOS design of cellular APAPs and FPAPAPs: an overview

Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2002-01-01)
CNN-based analog visual microprocessors have similarities with the so-called Single Instruction Multiple Data systems, ...
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Bio-inspired analog parallel array processor chip with programmable spatio-temporal dynamics

Carmona Galán, Ricardo; Jiménez Garrido, Francisco José; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2002-01-01)
A bio-inspired model for an analog parallel array processor (APAP), based on studies on the vertebrate retina, permits the ...
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CMOS realization of a 2-layer CNN universal machine chip

Carmona Galán, Ricardo; Jiménez Garrido, Francisco José; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2002-01-01)
Some of the features of the biological retina can be modelled by a cellular neural network (CNN) composed of two dynamically ...
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ACE16K: A 128×128 focal plane analog processor with digital I/O

Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael (Institute of Electrical and Electronics Engineers, 2002-01-01)
This paper presents a new generation 128×128 focal-plane analog programmable array processor (FPAPAP), from a system level ...
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A processing element architecture for high-density focal plane analog programmable array processors

Liñán Cembrano, Gustavo; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2002-01-01)
The architecture of the elementary Processing Element - PE- used in a recently designed 128×128 Focal Plane Analog ...
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A 2.5-V ΣΔ modulator in 0.25-um CMOS for ADSL

Río Fernández, Rocío del; Medeiro Hidalgo, Fernando; Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2002-01-01)
This paper presents a dual-quantization SC Sigma-Delta Modulator intended for A/D Conversion in ADSL applications.
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A behavioral modeling concept and practice of CNN-UM VLSI implementations

Földesy, Péter; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2001-01-01)
In this paper we introduce a novel simulation time bounded behavioral modeling technique that optimally selects the ...
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A complete retargeting methodology for mixed-signal IC designs

Castro López, Rafael; Fernández, F. V.; Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2001-01-01)
In this paper, an efficient methodology to retargeting and reuse of embedded mixed-signal blocks is presented. Parametrized ...
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ACE16k: A programmable focal plane vision processor with 128 x 128 resolution

Liñán Cembrano, Gustavo; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito (European Conference on Circuit Theory and Design, 2001-01-01)
This paper presents a new generation 128x128 Focal Plane Analog Programmable Array Processor (FPAPAP), from a system ...
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Mixed-signal map-configurable integrated chaos generator for digital communication systems

Delgado Restituto, Manuel ; Rodríguez Vázquez, Ángel Benito (2001-01-01)
In this paper, the methodological aspects for the design of mixed-signal map-configurable chaos generators are presented. ...
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Analysis and Modeling of the Non-Linear Sampling Process in Switched-Current Circuits - Application to Bandpass Sigma-Delta Modulators

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (2001-01-01)
This paper presents a precise model for the transient behaviour of Fully Differential (FD) SwItched-current (SI) memory ...
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Study of Non-Linear S/H Operation in Switched-Current Circuits Using Volterra Series - Application to BandPass Sigma-Delta Modulators

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (2001-01-01)
This paper analyses the transient behaviour of SwItched-current (SI) memory cells placed at the front-end of high-speed ...
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High-performance ΣΔ ADC for ADSL applications in 0.35μm CMOS digital technology

Río Fernández, Rocío del; Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2001-01-01)
We present a ΣΔ modulator designed for ADSL applications in a 0.3Sμm CMOS pure digital technology. It employs a 4th-order ...
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Top-Down Design of a xDSL 14-bit 4MSh ZA Modulator in Digital CMOS Technology

Río Fernández, Rocío del; Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2001-01-01)
This paper describes the design of a Sigma-Delta modulator aimed for A/D conversion in xDSL applications, featuring ...
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Analysis and Experimental Characterization of Idle Tones in 2nd-Order Bandpass Sigma-Delta Modulators - A 0.8μm CMOS Switched-Current Case Study

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2001-01-01)
Ths paper analyses the tonal behaviour of the quantization noise in 2nd-order bandpass SD modulators. The analysis previously ...
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Effect of Non-Linear Settling Error on The Harmonic Distortion of Fully-Differential Switched-Current BandPass Sigma-Delta Modulators

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2001-01-01)
This paper presents a detailed study of the effect of the non-linear settling on the harmonic distortion of BandPass SD ...
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A hierarchical approach for the symbolic analysis of large analog integrated circuits

Guerra Vinuesa, Oscar; Roca Moreno, Elisenda; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (IEEE computer society digital library, 2000-01-01)
This paper introduces a new hierarchical analysis methodology which incorporates approximation strategies during the ...
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A CMOS 0.8- µm transistor-only 1.63-MHz switched-current bandpass ΣΔ modulator for AM signal A/D conversion

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2000-01-01)
This paper presents a CMOS 0.8-/spl mu/m switched-current (SI) fourth-order bandpass /spl Sigma//spl Delta/ modulator ...
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Experimental Characterization of IdleTones in Second-Order Bandpass ΣΔ Modulators

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (2000-01-01)
This paper analyses the tonal behaviour of the quantization noise in second-order bandpass ΣΔ modulators. The analysis ...
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A 14-bit 4-MS/s Multi-bit Cascade Sigma-Delta Modulator in CMOS 0.35-um Digital Technology

Río Fernández, Rocío del; Medeiro Hidalgo, Fernando; Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (2000-01-01)
This paper presents a 4th-order 3-stage cascade SD modulator that achieves 14-bit dynamic range at 4MS/s using low ...
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Selection of test techniques for high-resolution ΣΔ modulators

Guerra Vinuesa, Oscar; Escalera Morón, Sara; Rosa Utrera, José Manuel de la; Compaigne, Eric; Galliard, Christophe; Rodríguez Vázquez, Ángel Benito (2000-01-01)
This paper introduces a new tool which allows the evaluation of different test techniques in a complete impartial manner. ...
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An error-controlled methodology for approximate hierarchical symbolic analysis

Guerra Vinuesa, Oscar; Rodríguez García, Juan D.; Roca Moreno, Elisenda; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2000-01-01)
Limitations of existing approaches for symbolic analysis of large analog circuits are discussed. To address their solution, ...
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High-order cascade multibit /spl Sigma//spl Delta/ modulators for xDSL applications

Río Fernández, Rocío del; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2000-01-01)
This paper explores the use of /spl Sigma//spl Delta/ modulators for A/D conversion in xDSL applications. Two high-order ...
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Review of CMOS implementations of the CNN universal machine-type visual microprocessors

Roska, Tamás; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2000-01-01)
While in most application areas digital processors can solve problems initially, in some fields their capabilities are ...
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A mixed-signal fuzzy controller and its application to soft start of DC motors

Navas González, Rafael; Vidal Verdú, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2000-01-01)
Presents a mixed-signal fuzzy controller chip and its application to control of DC motors. The controller is based on a ...
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A stored program 2/sup nd/ order/3-layer complex cell CNN-UM

Rekeczky, Csaba; Serrano Gotarredona, María Teresa; Roska, Tamás; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2000-01-01)
A stored program 2/sup nd/ order/3-layer complex cell cellular neural network Universal Machine (CNN-UM) architecture is ...
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Reliable analysis of settling errors in SC integrators-application to the design of high-speed /spl Sigma//spl Delta/ modulators

Río Fernández, Rocío del; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2000-01-01)
This paper presents a detailed study on the transient response of SC integrators which takes into account the effects of ...
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Realization of non-linear templates using the CNNUC3 prototype

Liñán Cembrano, Gustavo; Foldesy, Péter; Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael (Institute of Electrical and Electronics Engineers, 2000-01-01)
Demonstrates the processing capabilities of an analog programmable array processor chipMINUS/CNNUC3-which follows the ...
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Object oriented image segmentation on the CNNUC3 chip

Földesy, Péter; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael (Institute of Electrical and Electronics Engineers, 2000-01-01)
We show how a complex object oriented image analysis algorithm can be implemented on a CNNUM chip for video-coding. Besides ...
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Experimental demonstration of real-time image-processing using a VLSI analog programmable array processor

Liñán Cembrano, Gustavo; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Roca Moreno, Elisenda; Foldesy, Péter; Rodríguez Vázquez, Ángel Benito (SPIE- The International Society for Optical Engineering, 2000-01-01)
This paper describes a full-custom mixed-signal chip which embeds distributed optical signal acquisition, digitallyprogrammable analog ...
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Implementation of non-linear templates using a decomposition technique by a 0.5 /spl mu/m CMOS CNN universal chip

Liñán Cembrano, Gustavo; Foldesy, Péter; Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael (Institute of Electrical and Electronics Engineers, 2000-01-01)
This paper demonstrates the processing capabilities of a recently designed analog programmable array processor. This new ...
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CNN technology in action

Zarandy, Akos; Espejo Meana, Servando Carlos; Foldesy, Péter; Kek, Laszlo; Liñán Cembrano, Gustavo; Rekeczky, Csaba; Rodríguez Vázquez, Ángel Benito; Roska, Tamás; Szatmári, István; Sziranyi, Tamas; Szolgay, Péter (Institute of Electrical and Electronics Engineers, 2000-01-01)
Two Cellular Neural Net Universal Machine (CNN-UM) prototypes are demonstrated in action. The first one is the latest 4096 ...
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Programmable resolution imager for imaging applications

Roca Moreno, Elisenda; Soriano Pastor, Germán; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (SPIE- The International Society for Optical Engineering, 2000-01-01)
In this paper a programmable imager with averaging capabilities will be described which is intended for averaging of ...
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The CNNUC3: an analog I/O 64x64 CNN universal machine chip prototype with 7-bit analog accuracy

Liñán Cembrano, Gustavo; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2000-01-01)
This paper describes a full-custom mixed-signal chip which embeds distributed optical signal acquisition, digitally-programmable ...
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Structure reconfigurability of the CNNUC3 for robust template operation

Földesy, Péter; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael (Institute of Electrical and Electronics Engineers, 2000-01-01)
We demonstrate the importance of the reconfigurability of a 64/spl times/64 cells size CNN-UM chip. As we show, in such a ...
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A mixed-signal architecture for high complexity CMOS fuzzy controlers

Navas-González, L.; Vidal Verdú, Fernando; Rodríguez Vázquez, Ángel Benito (Universidad de Granada: Departamento de Ciencias de la Computación e Inteligencia Artificial, 1999-01-01)
Analog circuits provide better area/power efficiency than their digital counterparts for low-medium precision requirements ...
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A modular programmable CMOS analog fuzzy controller chip

Rodríguez Vázquez, Ángel Benito; Navas González, Rafael; Delgado Restituto, Manuel ; Vidal Verdú, Fernando (Institute of Electrical and Electronics Engineers, 1999-01-01)
We present a highly modular fuzzy inference analog CMOS chip architecture with on-chip digital progranirnability. This ...
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SIRENA: A CAD environment for behavioural modelling and simulation of VLSI cellular neural network chips

Carmona Galán, Ricardo; García Vargas, Ignacio; Liñán Cembrano, Gustavo; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito (Wiley-Blackwell, 1999-01-01)
This paper presents SIRENA, a CAD environment for the simulation and modelling of mixed-signal VLSI parallel processing ...
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Harmonic Distortion in Fully-Differential Switched-Current Sigma-Delta Modulators

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (1999-01-01)
This paper presents a systematic analysis of the harmonic distortion in SD modulators (SDMs) implemented with fully-differential ...
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Reliable analysis of settling errors in SC integrators - application to high-speed low-power ΣΔ modulators design

Río Fernández, Rocío del; Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (1999-01-01)
This paper presents a detailed study on the transient response of SC integrators taking into account the effects of amplifier ...
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An 0.5-μm CMOS analog random access memory chip for TeraOPS speed multimedia video processing

Carmona Galán, Ricardo; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito; Roska, Tamás; Kozek, Tibor; Chua, Leon O. (Institute of Electrical and Electronics Engineers, 1999-01-01)
Data compressing, data coding, and communications in object-oriented multimedia applications like telepresence, computer-aided ...
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Non-ideal quantization noise shaping in switched-current bandpass ΣΔ modulators

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1999-01-01)
This paper presents a systematic analysis of the major switched-current (SI) errors and their influence on the quantization ...
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RAPID-retargetability for reusability of application-driven quadrature D/A interface block design

Franca, J.; Horta, N.; Pereira, M.; Vital, J.; Castro López, Rafael; Delgado Restituto, Manuel; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito; Ramos, J.; Santos, P. (Institute of Electrical and Electronics Engineers, 1999-01-01)
This paper describes ESPRIT 29648, concerning the development of an advanced methodology for the design of a mixed-signal ...
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A 13-bit, 2.2-MS/s, 55-mW multibit cascade ΣΔ modulator in CMOS 0.7-μm single-poly technology

Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1999-01-01)
This paper presents a CMOS 0.7-μm ΣΔ modulator IC that achieves 13-bit dynamic range at 2.2 MS/s with an oversampling ratio ...
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Error control in simplification before generation algorithms for symbolic analysis of large analogue circuits

Rodríguez García, Juan D.; Guerra Vinuesa, Oscar; Roca Moreno, Elisenda; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1999-01-01)
Circuit reduction is a fundamental first step in addressing the symbolic analysis of large analogue circuits. A new algorithm ...
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On the Design of Second Order Dynamics Reaction-Diffusion CNNs

Serrano Gotarredona, María Teresa; Rodríguez Vázquez, Ángel Benito (Springer, 1999-01-01)
In this paper, a second order reaction-diffusion equation has been identified which is able to reproduce through parameter ...
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An accurate error control mechanism for simplification before generation algorithms

Guerra Vinuesa, Oscar; Rodríguez García, Juan D.; Roca Moreno, Elisenda; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1999-01-01)
The use of simplification before generation techniques to enable the approximate symbolic analysis of large analog circuits ...
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High-order cascade multi-bit Σ∆ modulators for high-speed A/D conversion

Río Fernández, Rocío del; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Universidad Carlos III, 1998-01-01)
The use of Sigma-Delta (Σ∆) modulation for analog-to-digital conversion (ADC) in the communication frequency range is ...
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Symbolic analysis of large analog integrated circuits: the numerical reference generation problem

Fernández Fernández, Francisco Vidal; Fernández Fernández, Francisco Vidal; Guerra Vinuesa, Oscar; Rodríguez García, Juan D.; Rodríguez Vázquez, Ángel Benito (IEEE press, 1998-01-01)
Symbolic analysis potentialities for gaining circuit insight and for efficient repetitive evaluations have been limited ...
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Electrooptical measurement system for the DC characterization of visible detectors for CMOS-compatible vision chips

Roca Moreno, Elisenda; Frutos Rayego, Fabián; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito (IEEE, 1998-01-01)
Abstract—An electrooptical measurement system for the dc characterization of visible detectors for CMOS-compatible ...
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Multiplexing architecture for mixed-signal CMOS fuzzy controllers

Vidal Verdú, Fernando; Navas González, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1998-01-01)
Limited precision imposes limits on the complexity of analogue circuits, and hence fuzzy analogue controllers are usually ...
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Multi-bit cascade ΣΔ modulator for high-speed A/D conversion with reduced sensitivity to DAC errors

Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1998-01-01)
This paper presents a ΣΔ modulator (ΣΔM) which combines single-bit and multi-bit quantization in a cascade architecture ...
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A CMOS 0.8 μm fully differential current mode buffer for HF SI circuits

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito (Elsevier, 1998-01-01)
We present a high-frequency fully-differential current-mode buffer to interface off-chip currents with no significant ...
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Fourth-order cascade SC ΣΔ modulators: a comparative study

Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1998-01-01)
Fourth-order cascade ΣΔ modulators are very well suited for IC implementation using analog sampled-data circuits because ...
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A multiplexed mixed-signal fuzzy architecture

Vidal Verdú, Fernando; Navas González, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1998-01-01)
Analog circuits provide better area/power efficiency than their digital counterparts for low-medium precision requirements. ...
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Mixed signal CMOS high precision circuits for on chip learning

Vidal Verdú, Fernando; Navas González, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1998-01-01)
Learning algorithms have become of great interest to be applied not only to neural or hybrid neuro-fuzzy systems, but also ...
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Practical considerations for the design of cascade multi-bit high-frequency /spl Sigma//spl Delta/ modulators

Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1998-01-01)
Recommendations are given for efficient design of high-frequency /spl Sigma//spl Delta/ modulators using multi-stage ...
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Integrated circuit blocks for a DCSK chaos radio

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito; Porra, Veikko (Institute of Electrical and Electronics Engineers, 1998-01-01)
A proposal for an integrated digital communication system using a DCSK chaotic modulation scheme is presented. It is a ...
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Behavioral modeling of PWL analog circuits using symbolic analysis

Fernández Fernández, Francisco Vidal; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1998-01-01)
Behavioral models are used both for top-down design and for bottom-up verification. During top-down design, models are ...
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A 0.5 /spl mu/m CMOS CNN analog random access memory chip for massive image processing

Carmona Galán, Ricardo; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito; Roska, Tamás; Kozek, Tibor; Chua, Leon O. (Institute of Electrical and Electronics Engineers, 1998-01-01)
An analog RAM has been designed to act as a cache memory for a CNN Universal Machine. Hence, all the non-standard chips ...
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Challenges in mixed-signal IC design of CNN chips in submicron CMOS

Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Espejo Meana, Servando Carlos (Institute of Electrical and Electronics Engineers, 1998-01-01)
Summary form only given. The contrast observed between the performance of artificial vision machines and "natural" vision ...
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Four-quadrant one-transistor-synapse for high-density CNN implementations

Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Carmona Galán, Ricardo (Institute of Electrical and Electronics Engineers, 1998-01-01)
Presents a linear four-quadrants, electrically-programmable, one-transistor synapse strategy applicable to the implementation ...
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Design considerations for integrated continuous-time chaotic oscillators

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1998-01-01)
This paper presents an optimization procedure to choose the chaotic state equation which is best suited for implementation ...
PhD Thesis
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Una técnica para el análisis de la variabilidad estadística en circuitos integrados analógicos

Rodríguez Vázquez, Ángel Benito; Rodríguez Macías, Rafael (1997-10-06)
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A 2.5MHz 55dB Switched-Current BandPass ΣΔ Modulator for AM Signal Conversion

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1997-01-01)
We present a Switched-Current (SI) fourth-order bandpass ΣΔ modulator IC prototype. It uses fully-differential circuits ...
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Bifurcations and synchronization using an integrated programmable chaotic circuit

Delgado Restituto, Manuel ; Liñán Cembrano, Gustavo; Ceballos Cáceres, Joaquín Francisco; Rodríguez Vázquez, Ángel Benito (World Scientific Publishing, 1997-01-01)
This paper presents a CMOS chip which can act as an autonomous stand-alone unit to generate different real-time chaotic ...
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Using CAD tools for shortening the design cycle of high-performance sigma–delta modulators: A 16·4 bit, 9·6 kHz, 1·71 mW ΣΔM in CMOS 0·7 μm technology

Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito (Wiley-Blackwell, 1997-01-01)
This paper uses a CAD methodology proposed by the authors to design a low-power 2nd-order Sigma-Delta Modulator (ΣΔM). ...
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Using CAD Tools for the Automatic Design of Low-Power ΣΔ Modulators

Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito (1997-01-01)
This paper illustrates the use of a CAD methodology to design a high-resolution 2nd-order ZA modulator with optimized power ...
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Quantization noise shaping degradation in switched-current bandpass sigma-delta modulators

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (1997-01-01)
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A one-transistor-synapse strategy for electrically-programmable massively-parallel analog array processors

Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo (Institute of Electrical and Electronics Engineers, 1997-01-01)
This paper presents a linear, four-quadrants, electrically-programmable, one-transistor synapse strategy applicable to the ...
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An algorithm for numerical reference generation in symbolic analysis of large analog circuits

García Vargas, Ignacio; Galán, Mariano; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1997-01-01)
This paper addresses the problems arising in the calculation of numerical references (network function coefficients), ...
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Design of a programmable mixed-signal CMOS image-processing chip in 0.8 /spl mu/m CMOS

Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Carmona Galán, Ricardo (Institute of Electrical and Electronics Engineers, 1997-01-01)
An operational vision-chip prototype with a wide-range of potential applications in artificial-vision systems is presented. ...
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A mismatch-insensitive high-accuracy high-speed continuous-time current comparator in low voltage CMOS

Río Fernández, Rocío del; Liñán Cembrano, Gustavo; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1997-01-01)
This paper presents a CMOS current comparator which employs nonlinear feedback to obtain high-accuracy (down to 1.5 pA) ...
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Some design trade-offs for large CNN chips using small-size transistors

Rodríguez Vázquez, Ángel Benito; Liñán Cembrano, Gustavo; Domínguez Castro, Rafael; Huertas Díaz, José Luis; Espejo Meana, Servando Carlos (Institute of Electrical and Electronics Engineers, 1997-01-01)
Small-size MOS transistors (MOST) exhibit a bunch of second-order effects which limit their application to design Cellular ...
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A modular CMOS analog fuzzy controller

Vidal Verdú, Fernando; Navas González, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1997-01-01)
The low/medium precision required for many fuzzy applications makes analog circuits natural candidates to design fuzzy ...
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Discrete-time integrated circuits for chaotic communication

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1997-01-01)
This paper gives design considerations for the synthesis of analog discrete-time encoder-decoder pairs based on digital ...
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Tools for Automated Design of ΣΔ Modulators

Medeiro Hidalgo, Fernando; Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Springer, 1997-01-01)
We present a set of CAD tools to design ΣΔ modulators. They use statistical optimization to calculate optimum specifications ...
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Mismatch distance term compensation in centroid configurations with nonzero-area devices

Sánchez Karhunen, Eduardo; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1997-01-01)
This paper presents an analytical approach to distance term compensation in mismatch models of integrated devices. Firstly, ...
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Comparison of matroid intersection algorithms for large circuit analysis

Galán, Mariano; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1997-01-01)
This paper presents two approaches to symbolic analysis of large analog integrated circuits via simplification during the ...
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A 0.8-μm CMOS two-dimensional programmable mixed-signal focal-plane array processor with on-chip binary imaging and instructions storage

Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo; Földesy, Péter; Zarándy, Ákos; Szolgay, Péter; Szirányi, Tamás; Roska, Tamás (Institute of Electrical and Electronics Engineers, 1997-01-01)
This paper presents a CMOS chip for the parallel acquisition and concurrent analog processing of two-dimensional (2-D) ...
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Robust high-accuracy high-speed continuous-time CMOS current comparator

Liñán Cembrano, Gustavo; Río Fernández, Rocío del; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1997-01-01)
The authors present a CMOS current comparator which employs nonlinear negative feedback to obtain high-accuracy (down to ...
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Learning under hardware restrictions in CMOS fuzzy controllers able to extract rules from examples

Vidal Verdú, Fernando; Navas González, Rafael; Rodríguez Vázquez, Ángel Benito (Universidad de Granada. Departamento de Ciencias de la Computación e Inteligencia Artificial, 1996-01-01)
Fuzzy controllers are able to incorporate knowledge expressed in if-then rules. These rules are given by experts or skilful ...
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A fourth-order bandpass ΣΔ modulator using current-mode analog/digital circuits

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1996-01-01)
We present a fourth-order bandpass ΣΔ switched-current modulator IC in 0.8 μm CMOS single-poly technology. Its architecture ...
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A 16 Rules@2.5Mflips Mixed-Signal Programmable Fuzzy Controller CMOS-1μm Chip

Vidal Verdú, Fernando; Navas González, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1996-01-01)
We present a fuzzy inference chip capable to evaluate 16 programmable rules at a speed of 2.5Mflips (2.5 × 10 6 fuzzy ...
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IC design for spread spectrum communication exploiting chaos

Delgado Restituto, Manuel; Liñán Reyes, Matías; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1996-01-01)
This paper presents a 2.4 /spl mu/m CMOS IC prototype which includes a programmable chaotic generator and some interface ...
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Current-mode piecewise-linear function generators

Delgado Restituto, Manuel; Ceballos Cáceres, Joaquín Francisco; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1996-01-01)
We present a systematic design technique for current-mode piecewise-linear (PWL) function generators. It uses two building ...
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CMOS design of adaptive fuzzy ASICs using mixed-signal circuits

Vidal Verdú, Fernando; Navas González, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1996-01-01)
Analog circuits are natural candidates to design fuzzy chips with optimum speed/power figures for precision up to about ...
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Symbolic analysis tools-the state of the art

Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1996-01-01)
This paper reviews the main last generation symbolic analyzers, comparing them in terms of functionality, pointing out also their shortcomings. The state of the art in this field is also studied, pointing out directions for future research.
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Hybrid-control of synapse circuits for programmable cellular neural networks

Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1996-01-01)
This paper describes a hybrid weight-control strategy for VLSI realizations of programmable Cellular Neural Networks (CNNs), ...
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CMOS 2.4μm chaotic oscillator: Experimental verification of chaotic encryption of audio

Delgado Restituto, Manuel; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1996-01-01)
The Letter reports the first experimental verification of chaotic encryption of audio using custom monolithic chaotic ...
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A Family of matroid intersection algorithms for the computation of approximated symbolic network functions

Wambacq, Piet; Fernández Fernández, Francisco Vidal; Gièlen, Georges G.E.; Sansen, Willy M.C.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1996-01-01)
In recent years, the technique of simplification during generation has turned out to be very promising for the efficient ...
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Mixed-signal CNN array chips for image processing

Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Carmona Galán, Ricardo; Roca Moreno, Elisenda (The International Society for Optical Engineering, 1996-01-01)
Due to their local connectivity and wide functional capabilities, cellular nonlinear networks (CNN) are excellent candidates ...
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A modulator/demodulator CMOS IC for chaotic encryption of audio

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito; Liñán Cembrano, M. (Institute of Electrical and Electronics Engineers, 1995-01-01)
This paper reports the first experimental verification of chaotic encryption of audio signals using integrated circuits. ...
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Experimental verification of chaotic encryption of audio using monolithic chaotic modulators

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito; Liñán Reyes, Matías (SPIE- The International Society for Optical Engineering, 1995-01-01)
This paper reports the first experimental verification of chaotic encryption of audio signals using integrated circuits. ...
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Using Building Blocks to Design Analog Neuro-Fuzzy Controllers

Vidal Verdú, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1995-01-01)
We present a parallel architecture for fuzzy controllers and a methodology for their realization as analog CMOS chips for ...
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Secure communication through switched-current chaotic circuits

Delgado Restituto, Manuel; López de Ahumada Gutiérrez, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1995-01-01)
This paper presents the use of analog integrated circuits for secure communication based on chaos synchronization. The ...
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Modular Design of Adaptive Analog CMOS Fuzzy Controller Chips

Rodríguez Vázquez, Ángel Benito; Vidal Verdú, Fernando (Institute of Electrical and Electronics Engineers, 1995-01-01)
Analog circuits are natural candidates to design fuzzy chips with optimum speed/power figures for precision up to about ...
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Efficient symbolic computation of approximated small-signal characteristics of analog integrated circuits

Wambacq, Piet; Fernández Fernández, Francisco Vidal; Gielen, Georges; Sansen, Willy M.C.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1995-01-01)
A symbolic analysis tool is presented that generates simplified symbolic expressions for the small-signal characteristics ...
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Learning in neuro/fuzzy analog chips

Rodríguez Vázquez, Ángel Benito; Vidal Verdú, Fernando (Institute of Electrical and Electronics Engineers, 1995-01-01)
This paper focus on the design of adaptive mixed-signal fuzzy chips. These chips have parallel architecture and feature ...
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Realization of a CNN universal chip in CMOS technology

Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1995-01-01)
This paper describes the design of a programmable Cellular Neural Network (CNN) chip, with additional functionalities ...
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Tool for fast mismatch analysis of analog circuits

Rodríguez Macías, Rafael; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1995-01-01)
A tool is presented that evaluates statistical deviations in performance characteristics of analog circuits, starting from ...
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A CMOS fully-differential bandpass ΣΔ modulator using switched-current circuits

Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1995-01-01)
This paper presents a fourth-order bandpass sigma-delta modulator that has been designed using fully-differential ...
PhD Thesis
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Redes neuronales celulares: modelado y diseño monolítico

Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos (1994-03-21)
Las aportaciones principales de esta Tesis se refieren al diseño de circuitos electrónicos con las primitivas disponibles ...
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Global design of analog cells using statistical optimization techniques

Medeiro Hidalgo, Fernando; Rodríguez Macías, R.; Fernández Fernández, Francisco Vidal; Domínguez Castro, Rafael; Huertas Díaz, José Luis; Rodríguez Vázquez, Ángel Benito (Springer, 1994-01-01)
We present a methodology for automated sizing of analog cells using statistical optimization in a simulation based approach. ...
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A countinuous-time cellular neural network chip for direction-selectable connected component detection with optical image acquisition

Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1994-01-01)
This paper presents a continuous-time Cellular Neural Network (CNN) chip [1] for the application of Connected Component ...
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Current-mode building blocks for CMOS-VLSI design of chaotic neural networks

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1994-01-01)
This paper presents two nonlinear CMOS current-mode circuits that implement neuron soma equations for chaotic neural ...
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A basic building block approach to CMOS design of analog neuro/fuzzy systems

Vidal Verdú, Fernando; Rodríguez Vázquez, Ángel Benito; Linares Barranco, Bernabé; Sánchez Sinencio, Edgar (Institute of Electrical and Electronics Engineers, 1994-01-01)
Outlines a systematic approach to design fuzzy inference systems using analog integrated circuits in standard CMOS VLSI ...
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CMOS current-mode chaotic neurons

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1994-01-01)
This paper presents two nonlinear CMOS current-mode circuits that implement neuron soma equations for chaotic neural ...
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Algorithm for efficient symbolic analysis of large analogue circuits

Wambacq, Piet; Gièlen, Georges G.E.; Sansen, Willy M.C.; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (Institution of Engineering and Technology, 1994-01-01)
An algorithm is presented that generates simplified symbolic expressions for the small-signal characteristics of large ...
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CMOS optical-sensor array with high output current levels and automatic signal-range centring

Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1994-01-01)
A CMOS compatible photosensor with high output current levels, and an area-efficient scheme for automatic signal-range ...
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Convergence and stability of the FSR CNN model

Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Carmona Galán, Ricardo (Institute of Electrical and Electronics Engineers, 1994-01-01)
Stability and convergency results are reported for a modified continuous-time CNN model. The signal range of the state ...
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Symbolic analysis of large analog integrated circuits by approximation during expression generation

Fernández Fernández, Francisco Vidal; Wambacq, Piet; Gièlen, Georges G.E.; Rodríguez Vázquez, Ángel Benito; Sansen, Willy M.C. (Institute of Electrical and Electronics Engineers, 1994-01-01)
A novel algorithm is presented that generates approximate symbolic expressions for small-signal characteristics of large ...
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SIRENA: A simulation environment for CNNs

Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito; García Vargas, Ignacio; Ramos, Juan F.; Carmona Galán, Ricardo (Institute of Electrical and Electronics Engineers, 1994-01-01)
SIRENA is a general simulation environment for artificial neural networks, with emphasis towards CNNs. A special interest ...
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Modeling OpAmp-induced harmonic distortion for switched-capacitor ΣΔ modulator design

Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1994-01-01)
This communication reports a new modeling of opamp-induced harmonic distortion in SC ΣΔ modulators, which is aimed to ...
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Weight-control strategy for programmable CNN chips

Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito; Carmona Galán, Ricardo (Institute of Electrical and Electronics Engineers, 1994-01-01)
This paper describes a hybrid weight-control strategy for the VLSI realization of programmable CNNs, based on automatic ...
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CNN universal chip in CMOS technology

Domínguez Castro, Rafael; Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1994-01-01)
This paper describes the design of a CNN universal chip in a standard CMOS technology. The core of the chip consists of ...
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Smart-Pixel Cellular Neural Networks in Analog Current-Mode CMOS Technology

Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Huertas Díaz, José Luis; Sánchez Sinencio, Edgar (Institute of Electrical and Electronics Engineers, 1994-01-01)
This paper presents a systematic approach to design CMOS chips with concurrent picture acquisition and processing capabilities. ...
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Switched-Current Chaotic Neurons

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1994-01-01)
The Letter presents two nonlinear CMOS current-mode circuits that implement neuron soma equations for chaotic neural ...
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A CMOS analog adaptive BAM with on-chip learning and weight refreshing

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1993-01-01)
In this paper we will extend the transconductance-mode (T-mode) approach [1] to implement analog continuous-time neural ...
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Current-Mode Techniques for the Implementation of Continuous- and Discrete-Time Cellular Neural Networks

Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1993-01-01)
This paper presents a unified, comprehensive approach to the design of continuous-time (CT) and discrete-time (DT) cellular ...
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CMOS design of chaotic oscillators using state variables: a monolithic Chua's circuit

Rodríguez Vázquez, Ángel Benito; Delgado Restituto, Manuel (Institute of Electrical and Electronics Engineers, 1993-01-01)
This paper presents design considerations for monolithic implementation of piecewise-linear (PWL) dynamic systems in CMOS ...
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Nonlinear switched-current CMOS IC for random signal generation

Delgado Restituto, Manuel; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1993-01-01)
A nonlinear switched-current circuit is presented that implements a chaotic algorithm for the generation of broadband, ...
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A Tool for automated design of sigma-delta modulators using statistical optimization

Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1993-01-01)
A tool is presented which starting from high level specifications of SC σδ modulators (resolution, bandwidth and oversampling ...
Presentation
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A Model for VLSI implementation of CNN image processing chips using current-mode techniques

Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Linares Barranco, Bernabé; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1993-01-01)
A new Cellular Neural Network model is proposed which allows simpler and faster VLSI implementation than previous models. ...
PhD Thesis
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Optimizadores neuronales usando circuitos analógico-digitales

Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael (1992-01-01)
PhD Thesis
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Técnicas de análisis simbólico para el modelado y diseño de circuitos integrados analógicos

Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (1992-01-01)
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A modular T-mode design approach for analog neural network hardware implementations

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1992-01-01)
A modular transconductance-mode (T-mode) design approach is presented for analog hardware implementations of neural networks. ...
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1/f/sup y/ noise generation through a chaotic nonlinear switched-capacitor circuit

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1992-01-01)
A programmable switched-capacitor circuit for the generation of 1/f/sup y/ noise is reported. The circuit is described by ...
Article
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Analog Neural Programmable Optimizers in CMOS VLSI Technologies

Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis; Sánchez Sinencio, Edgar (Institute of Electrical and Electronics Engineers, 1992-01-01)
A 3-μm CMOS IC is presented demonstrating the concept of an analog neural system for constrained optimization. A serial ...
Presentation
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Switched-current techniques for image processing Cellular Neural Networks in MOS VLSI

Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1992-01-01)
An architecture and related building blocks are presented for the realization of image processing tasks using current-mode ...
Presentation
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A prototype tool for optimum analog sizing using simulated annealing

Medeiro Hidalgo, Fernando; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1992-01-01)
It is shown that using simulated annealing in combination with electrical simulation provides a powerful tool allowing ...
Presentation
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CMOS analog neural network systems based on oscillatory neurons

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1992-01-01)
This paper addresses the design of two neural network systems based on the use of pulsing neurons. Each neuron is built ...
Presentation
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A piecewise-linear function approximation using current mode circuits

Ramírez Angulo, Jaime; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1992-01-01)
A methodology to design currentmode circuits for piecewise-linear function approximation is presented. The technique is ...
Presentation
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Modular analog continuous-time VLSI neural networks with on chip hebbian learning and analog storage

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1992-01-01)
A modular analog circuit design approach for hardware implementations of neural networks is presented. This approach is ...
Presentation
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On simplification techniques for symbolic analysis of analog integrated circuits

Fernández Fernández, Francisco Vidal; Martín, J. D.; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1992-01-01)
This paper addresses the topic of formula simplification for symbolic analyzers. Previously reported criteria for flat ...
Presentation
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Architectures and building blocks for CMOS VLSI analog "neural" programmable optimizers

Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis; Sánchez Sinencio, Edgar (Institute of Electrical and Electronics Engineers, 1992-01-01)
A modular reconfigurable serial architecture is presented for the analog/digital implementation of constrained optimization ...
Article
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A Chaotic Switched-Capacitor Circuit for 1/f Noise Generation

Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1992-01-01)
A switched-capacitor circuit is reported for the generation of 1 / fYnoise. The circuit is described by a chaotic first-order ...
Article
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CMOS OTA-C high-frequency sinusoidal oscillators

Linares Barranco, Bernabé; Rodríguez Vázquez, Ángel Benito; Sánchez Sinencio, Edgar; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1991-01-01)
Several topology families are given to implement practical CMOS sinusoidal oscillators by using operational transconductance ...
Presentation
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An advanced symbolic analyzer for the automatic generation of analog circuit design equations

Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1991-01-01)
A tool for symbolic analysis of analog integrated circuits is presented featuring accurate simplification, pole/zero ...
Presentation
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Hysteresis based neural oscillators for VLSI implementations

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1991-01-01)
The actual tendency in most of the work that is being done in VLSI neural network research is to use the simplest possible ...
Presentation
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Frequency tuning loop for VCOs

Linares Barranco, Bernabé; Rodríguez Vázquez, Ángel Benito; Sánchez Sinencio, Edgar; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1991-01-01)
A frequency tuning circuit is introduced for VCOs (voltage-controlled oscillators) so that the final relationship between ...
Presentation
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VLSI implementation of a transconductance mode continuous BAM with on chip learning and dynamic analog memory

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1991-01-01)
In this paper we present a complete VLSI Continuous-Time Bidirectional Associative Memory (BAM). The short term memory ...
Presentation
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Design of RC-active oscillators using composite amplifiers

Pérez Verdú, Belén; Huertas Díaz, José Luis; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1991-01-01)
The design of composite opamp Wien-Bridge oscillators is systematically approached by using a general model including ...
Article
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A switched-capacitor broadband noise generator for CMOS VLSI

Rodríguez Vázquez, Ángel Benito; Delgado Restituto, Manuel; Espejo Meana, Servando Carlos; Huertas Díaz, José Luis (Institution of Engineering and Technology, 1991-01-01)
A switched-capacitor circuit is reported for the generation of broadband white noise in MOS VLSI. It is based on the ...
PhD Thesis
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Diseño en tecnología CMOS de osciladores controlados por tensión de alta frecuencia en modo de transconductancia

Rodríguez Vázquez, Ángel Benito; Linares Barranco, Bernabé (1990-01-01)
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On the Design of Voltage-Controlled Sinusoidal Oscillators Using OTA's

Rodríguez Vázquez, Ángel Benito; Linares Barranco, Bernabé; Huertas Díaz, José Luis; Sánchez Sinencio, Edgar (Institute of Electrical and Electronics Engineers, 1990-01-01)
A unified systematic approach to the design of voltage-controlled oscillators using only operational transconductance ...
Presentation
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A CMOS Implementation of Fitzhugh-Nagumo Neuron Model

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1990-01-01)
A CMOS circuit is proposed that emulates FitzHugh-Nagumo's differential equations using OTAs, diode connected MOSFETs and ...
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Accurate design of analog CNN in CMOS digital technologies

Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1990-01-01)
Explores the design of cellular neural networks (CNN) by using sampled-data analog current-mode techniques which neither ...
Presentation
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CMOS circuit implementations for neuron models

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1990-01-01)
The mathematical neuron basic cells used as basic cells in popular neural network architectures and algorithms are discussed. ...
Presentation
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Very high frequency CMOS OTA-C quadrature oscillators

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1990-01-01)
An approach to the design of high-frequency monolithic voltage-controlled oscillators using operational transconductance ...
Presentation
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Design of an analog/digital truly random number generator

Espejo Meana, Servando Carlos; Martín, J. D.; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1990-01-01)
An analog-digital system is presented for the generation of truly random (aperiodic) digital sequences. This model is based ...
Presentation
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Analog neural networks for real-time constrained optimization

Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis; Sánchez Sinencio, Edgar; Linares Barranco, Bernabé (Institute of Electrical and Electronics Engineers, 1990-01-01)
Architectures and circuit techniques for implementing general piecewise constrained optimization problems using VLSI ...
Presentation
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A novel CMOS analog neural oscillator cell

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Newcomb, Robert W.; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1989-01-01)
A very flexible programmable CMOS analog neural oscillator cell architecture is presented. The proposed neuron circuit ...
Presentation
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Application of piecewise-linear switched-capacitor circuits for random number generation

Espejo Meana, Servando Carlos; Martín Gómez, José Domingo; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1989-01-01)
An unconventional application of switched-capacitor (SC) circuits is discussed. A systematic method for the design of ...
Presentation
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Analog integrated neural-like circuits for nonlinear programming

Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Huertas Díaz, José Luis; Sánchez Sinencio, Edgar (Institute of Electrical and Electronics Engineers, 1989-01-01)
A systematic approach for the design of analog neural nonlinear programming solvers using switched-capacitor (SC) integrated ...
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Operational transconductance amplifier-based nonlinear function syntheses

Sánchez Sinencio, Edgar; Ramírez Angulo, Jaime; Linares Barranco, Bernabé; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1989-01-01)
It is shown that the operational transconductance amplifier, as the active element in basic building blocks, can be ...
Article
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10mhz cmos ota-c voltage-controlled quadrature oscillator

Linares Barranco, Bernabé; Rodríguez Vázquez, Ángel Benito; Sánchez Sinencio, Edgar; Huertas Díaz, José Luis (Institution of Engineering and Technology, 1989-01-01)
A quadrature-type voltage-controlled oscillator with operational transconductance amplifiers and capacitors (OTA-C) is ...
Presentation
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OTA-based non-linear function approximations

Sánchez Sinencio, Edgar; Ramírez Angulo, Jaime; Linares Barranco, Bernabé; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1989-01-01)
The suitability of operational transconductance amplifiers (OTAs) as the main active element to obtain basic building ...
Presentation
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Nonlinear time-domain macromodeling of OTA circuits

Pérez Verdú, Belén; Cruz Moreno, J.; Linares Barranco, Bernabé; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis; Sánchez Sinencio, Edgar (Institute of Electrical and Electronics Engineers, 1989-01-01)
The authors present an accurate nonlinear macromodel of the operational transconductance amplifier (OTA) which is suitable ...
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A Programmable Neural Oscillator Cell

Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1989-01-01)
A programmable analog neural oscillator cell architecture is presented. The proposed neuron circuit is of hysteretic neural ...
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A new nonlinear time-domain op-amp macromodel using threshold functions and digitally controlled network elements

Pérez Verdú, Belén; Huertas Díaz, José Luis; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1988-01-01)
A general-purpose nonlinear macromodel for the time-domain simulation of integrated circuit operational amplifiers (op ...
Presentation
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Generation and design of sinusoidal oscillators using OTAS

Linares Barranco, Bernabé; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis; Sánchez Sinencio, Edgar; Hoyle, Javier J. (Institute of Electrical and Electronics Engineers, 1988-01-01)
The design of voltage-controlled oscillators (VCOs) using operational transconductance amplifiers (OTAs) is discussed. ...
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Switched-capacitor neural networks for linear programming

Rodríguez Vázquez, Ángel Benito; Rueda Rueda, Adoración; Huertas Díaz, José Luis; Domínguez Castro, Rafael (Institution of Engineering and Technology, 1988-01-01)
A circuit for online solving of linear programming problems is presented. The circuit uses switched-capacitor techniques ...
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Chaos From Switched-Capacitor Circuits: Discrete Maps

Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis; Rueda Rueda, Adoración; Pérez Verdú, Belén (Institute of Electrical and Electronics Engineers, 1987-01-01)
A special-purpose analog computer made of switched-capacitor circuits is presented for analyzing chaos and bifurcation ...
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Chaos via a piecewise-linear switch ed-capacitor circuit

Rodríguez Vázquez, Ángel Benito; Rueda Rueda, Adoración; Pérez Verdú, Belén; Huertas Díaz, José Luis (Institution of Engineering and Technology, 1987-01-01)
A nonlinear switched-capacitor circuit that generates chaotic signals is reported. The circuit is described by a first-order ...
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High-Frequency Design of the Wien-Bridge Oscillator Using Composite Amplifiers

Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis; Pérez Verdú, Belén (Institute of Electrical and Electronics Engineers, 1987-01-01)
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Nonlinear Switched-Capacitor Networks: Basic Principles and Piecewise-Linear Design

Huertas Díaz, José Luis; Chua, Leon O.; Rodríguez Vázquez, Ángel Benito; Rueda Rueda, Adoración (Institute of Electrical and Electronics Engineers, 1985-01-01)
The applicability of switched-capacitor (SC) components to the design of nonlinear networks is extensively discussed in ...
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Chaos in a Switched-Capacitor Circuit

Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis; Chua, Leon O. (Institute of Electrical and Electronics Engineers, 1985-01-01)
We report chaotic phenomena observed from a simple nonlinear switched-capacitor circuit. The experimentally measured ...
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Circuits and Systems Letters: A Novel SC Oscillator

Huertas Díaz, José Luis; Rodríguez Vázquez, Ángel Benito; Pérez Verdú, Belén (Institute of Electrical and Electronics Engineers, 1984-01-01)
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New analogue switch circuit having very low forward resistance

Huertas Díaz, José Luis; Rodríguez Vázquez, Ángel Benito; Rueda Rueda, Adoración (Institution of Engineering and Technology, 1984-01-01)
A new circuit realisation for an analogue switch is reported. The main feature of the proposed design is the low value of ...
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On the Active Compensation of Operational Amplifier Based VCVS

Huertas Díaz, José Luis; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1982-01-01)
A unified treatment of the active compensation for VCVS realized by operational amplifiers is presented. It is a summary ...
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Novel active-compensated weighted summer

Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institution of Engineering and Technology, 1980-01-01)
A summer amplifier with extended bandwidth is proposed. Compensation of the frequency characteristics is achieved by employing two operational amplifiers instead of external reactive components.