NameGonzález Carvajal, Ramón
DepartmentIngeniería Electrónica
Knowledge areaTecnología Electrónica
Professional categoryCatedrático de Universidad
E-mailRequest
           
  • No. publications

    81

  • No. visits

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  • No. downloads

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Article
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0.35-V SR-Enhanced Bulk-Driven OTA for Loads up to 10 nF

Ballo, Andrea; González Carvajal, Ramón; Grasso, Alfio Dario; Luján Martínez, Clara Isabel; Pennisi, Salvatore; Venezia, Chiara (IEEE, 2024)
This study presents a low-voltage bulk-driven CMOS operational transconductance amplifier (OTA) operating in the subthreshold ...
Article
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AIoT in Agriculture: Safeguarding Crops from Pest and Disease Threats

Blanco-Carmona, Pedro; Baeza Moreno, Lucía; Hidalgo Fort, Eduardo; Martín Clemente, Rubén; González Carvajal, Ramón; Muñoz Chavero, Fernando (MDPI, 2023)
A significant proportion of the world’s agricultural production is lost to pests and diseases. To mitigate this problem, ...
Article
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Wireless and Low-Power System for Synchronous and Real-Time Structural-Damage Assessment

Hidalgo Fort, Eduardo; Blanco-Carmona, Pedro; García-Oya, José Ramón; Muñoz Chavero, Fernando; González Carvajal, Ramón; Serrano Chacón, Álvaro Rubén; Mascort-Albea, Emilio J. (Institute of Electrical and Electronics Engineers (IEEE), 2023)
The rise of the Internet of Things (IoT) systems and the evolution of low-power wide-area networks have directly contributed ...
Article
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Battery-Less Industrial Wireless Monitoring and Control System for Improved Operational Efficiency

Hidalgo Fort, Eduardo; Gómez Galán, Juan Antonio; González Carvajal, Ramón; Sánchez Cárdenas, Pedro; Clemente Maya, Carlos (MDPI, 2023)
An industrial wireless monitoring and control system, capable of supporting energy-harvesting devices through smart sensing ...
Article
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Data Driven Energy Economy Prediction for Electric City Buses Using Machine Learning

Sennefelder, Roman Michael; Martín Clemente, Rubén; González Carvajal, Ramón; Trifonov, Dimitar (IEEE, 2023)
Electrification of transportation systems is increasing, in particular city buses raise enormous potential. Deep understanding ...
Article
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Cross Correlation-Based Ultrasonic Gas Flow Sensor With Temperature Compensation

García-Oya, José Ramón; Hidalgo Fort, Eduardo; Narbona Miguel, Daniel; Sainz Rojas, Alejandro; González Carvajal, Ramón; Muñoz Chavero, Fernando (Institute of Electrical and Electronics Engineers (IEEE), 2023)
In this article, the design of an ultrasonic gas flow sensor with a low cost and low energy temperature compensation method ...
Article
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Energy Consumption Prediction of Electric City Buses Using Multiple Linear Regression

Sennefelder, Roman Michael; Martín Clemente, Rubén; González Carvajal, Ramón (MDPI, 2023)
The widespread electrification of public transportation is increasing and is a powerful way to reduce greenhouse gas (GHG) ...
Final Degree Project
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Diseño y desarrollo de un sistema de optimización energética en el hogar

Poblacion Salvatierra, Mikel; Hidalgo Fort, Eduardo; González Carvajal, Ramón (2023)
Las energías renovables están siendo cada vez más utilizadas gracias al avance que se está haciendo en las tecnologías que ...
Final Degree Project
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Sistema de gazetracking con YOLOv8

Clavijo Chacón, Francisco José; González Carvajal, Ramón (2023)
El seguimiento del movimiento de los ojos o gazetracking es algo que lleva estudiándose desde comienzos del siglo XIX y ...
Article
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Low-Power Transit Time-Based Gas Flow Sensor with Accuracy Optimization

García-Oya, José Ramón; Sainz Rojas, Alejandro; Narbona Miguel, Daniel; González Carvajal, Ramón; Muñoz Chavero, Fernando (MDPI, 2022)
In this paper, a fully designed ultrasonic transit time-based gas flow sensor is presented. The proposed sensor has been ...
Article
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±0.3V Bulk-Driven Fully Differential Buffer with High Figures of Merit

Gangineni, Manaswini; Ramírez Angulo, Jaime; Vázquez Leal, Héctor; Huerta Chua, Jesús; López Martín, Antonio J.; González Carvajal, Ramón (MDPI, 2022)
A high performance bulk-driven rail-to-rail fully differential buffer operating from ±0.3V supplies in 180 nm CMOS technology ...
Article
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Industry 4.0: A Proposal of Paradigm Organization Schemes from a Systematic Literature Review

Rocha Jácome, Cristian; González Carvajal, Ramón; Muñoz Chavero, Fernando; Guevara Cabezas, Esteban; Hidalgo Fort, Eduardo (MDPI, 2022)
Currently, the concept of Industry 4.0 is well known; however, it is extremely complex, as it is constantly evolving and ...
Final Degree Project
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Reconocimiento de objetos mediante técnicas de visión por computador y aprendizaje automático

Martín Romero, Manuel; González Carvajal, Ramón; Martín Clemente, Rubén (2022)
Con la llegada de la denominada Industria 4.0 comienza a haber una demanda por sistemas de visión e inferencia basados en ...
Final Degree Project
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Diseño y desarrollo de un sistema de precintado remoto sobre FreeRTOS para sistemas IoT

Vivancos Porras, Carmen; González Carvajal, Ramón; Hidalgo Fort, Eduardo (2022)
Las comunicaciones inalámbricas, han experimentado una gran expansión en los últimos años en nuestras vidas y se hace casi ...
Master's Final Project
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Metrics system

Neira Jaén, Daniel; González Carvajal, Ramón; Girona García, Rafael (2022)
La medición y el monitoreo de sistemas resultan prácticamente imprescindibles en un desarrollo maduro y es ahí donde nos ...
Article
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Super-Gain-Boosted AB-AB Fully Differential Miller Op-Amp With 156dB Open-Loop Gain and 174MV/V MHZ pF/µW Figure of Merit in 130nm CMOS Technology

Paul, Anindita; Ramírez Angulo, Jaime; Díaz Sánchez, Alejandro; López Martín, Antonio J.; González Carvajal, Ramón; X. Li, Frank (Institute of Electrical and Electronics Engineers Inc., 2021)
A fully differential Miller op-amp with a composite input stage using resistive local common-mode feedback and regulated ...
Article
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Energy-Efficient Amplifiers Based on Quasi-Floating Gate Techniques

López-Martín, Antonio J.; Garde, M. Pilar; Algueta-Miguel, Jose M.; Beloso-Legarra, Javier; González Carvajal, Ramón; Ramírez Angulo, Jaime (MDPI, 2021)
Energy efficiency is a key requirement in the design of amplifiers for modern wireless applications. The use of quasi-floating ...
Final Degree Project
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Diseño y desarrollo de un driver de control para la estación SPS30 y su integración en FreeRTOS

Barba Lozano, Pedro; González Carvajal, Ramón; Hidalgo Fort, Eduardo (2021)
De acuerdo con la EPA (Agencia de Protección Ambiental de Estados Unidos), el tamaño de las partículas está directamente ...
Final Degree Project
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Diseño de etapas amplificadoras de bajo consumo para señales ultrasónicas

Bravo Salguero, Esther María; González Carvajal, Ramón (2021)
Las señales ultrasónicas o ultrasonidos son una serie de ondas mecánicas, normalmente longitudinales, cuya frecuencia está ...
Master's Final Project
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Diseño de sistema de inteligencia artificial para la implantación de un modelo de agricultura eco sostenible empleando técnicas de aprendizaje automático

Carmona Rebollo, Lucía; González Carvajal, Ramón; Martín Clemente, Rubén (2021)
En este proyecto se ha desarrollado un sistema de inteligencia artificial para la implantación de un nuevo modelo productivo ...
Final Degree Project
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Diseño de un HUB Wireless M-Bus-NbIoT

Ávila Soriano, Alberto; González Carvajal, Ramón (2021)
El agua es un recurso indispensable para la vida en nuestro planeta y para la gran mayoría de las actividades económicas ...
Article
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An Enhanced Gain-Bandwidth Class-AB Miller op-amp with 23,800 MHz·pF/mW FOM, 11-16 Current Efficiency and Wide Range of Resistive and Capacitive Loads Driving Capability

Anindita, Paul; Ramírez Angulo, Jaime; Díaz Sánchez, Alejandro; López Martín, Antonio J.; González Carvajal, Ramón; X. Li, Frank (Institute of Electrical and Electronics Engineers Inc., 2021)
A compact power-efficient class-AB Miller op-amp is introduced. It uses a simple auxiliary circuit that enhances the ...
Final Degree Project
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Instrumentación inteligente no invasiva para procesos en ganadería y agricultura

Prieto Ferrer, Miguel Ángel; González Carvajal, Ramón (2021)
La fiebre en los cerdos y el estrés hídrico que sufren las plantas son algunos ejemplos de las preocupaciones de la industria ...
Final Degree Project
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Desarrollo firmware de un driver de control para el módulo Sigfox AX-SF10 ANT21-868

Delgado Venzalá, María del Carmen; González Carvajal, Ramón; Hidalgo Fort, Eduardo (2021)
El trabajo que leerá a continuación presenta el desarrollo firmware de un sistema inalámbrico, cuya funcionalidad será ...
Final Degree Project
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Estudio de la arquitectura DDS y diseño de una solución aplicada sobre arquitectura genérica de vehículos

Pajuelo Durán, Rafael; González Carvajal, Ramón; Hidalgo Fort, Eduardo (2021)
En este proyecto se pretende establecer una red de comunicaciones en el entorno de un vehículo genérico, basado en tecnologías ...
Master's Final Project
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Creación de una herramienta basada en datos reales obtenidos por telemetría para la electrificación de flotas

Robles López, Celia; González Carvajal, Ramón (2021)
La transición hacia una movilidad eléctrica es uno de los objetivos mundiales en la lucha contra el cambio climático y la ...
Article
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Low-Voltage 0.81mW, 1-32 CMOS VGA with 5% Bandwidth variations and 38dB DC rejection

Rico-Aniles, Héctor Daniel; Ramírez Angulo, Jaime; Rocha-Pérez, José Miguel; López-Martín, Antonio J.; González Carvajal, Ramón (Institute of Electrical and Electronics Engineers (IEEE), 2020)
A CMOS low-voltage amplifier with approximately constant bandwidth and DC rejection is introduced. The design is based on ...
Article
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Compressive-Sensing-Based Reflectometer for Sparse-Fault Detection in Elevator Belts

García-Oya, José Ramón; Hidalgo Fort, Eduardo; Muñoz Chavero, Fernando; González Carvajal, Ramón (Institute of Electrical and Electronics Engineers (IEEE), 2020)
This article presents a design approach to the early detection of elevator-belt failures. The proposed system is based on ...
PhD Thesis
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Internet of Things en sistemas de monitorización inteligente con aplicación en transporte e infraestructuras

Hidalgo Fort, Eduardo; Muñoz Chavero, Fernando; González Carvajal, Ramón; García-Oya, José Ramón (2020)
Final Degree Project
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Diseño de tests unitarios para el TWR-KM34Z50M

Neira Jaén, Daniel; González Carvajal, Ramón; Girona García, Rafael (2020)
El avance imparable de la tecnología nos lleva a incorporarla a mundos en los que hasta hace relativamente poco resultaba ...
Master's Final Project
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Design and Implementation of a Drone Quadcopter Using Low Cost Microcontrollers

López Flores, Pablo; González Carvajal, Ramón (2020)
The objective of this project was defined as the design and implementation of a drone quadcoper using low cost microcontrollers. As ...
Article
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Power Efficient Simple Technique to Convert a Reset-and-Hold Into a True-Sample-and-Hold Using an Auxiliary Output Stage

Rico-Aniles, Héctor Daniel; Ramírez Angulo, Jaime; López-Martín, Antonio J.; González Carvajal, Ramón; Rocha-Pérez, José Miguel; Garde, M. Pilar (IEEE, 2020)
A technique to implement true-sample-and-hold circuits that hold the output for almost the entire clock cycle without ...
Article
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±0.25-V Class-AB CMOS Capacitance Multiplier and Precision Rectifiers

Pourashraf, Shirin; Ramírez Angulo, Jaime; Hinojo Montero, José María; González Carvajal, Ramón; López Martín, Antonio J. (IEEE (Institute of Electrical and Electronics Engineers), 2019)
Reduction of minimum supply requirements is a crucial aspect to decrease the power consumption in VLSI systems. A ...
Final Degree Project
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Desarrollo de soluciones IoT con Mbed

Salvador Vázquez, José Manuel; González Carvajal, Ramón (2019)
El Internet de las cosas o IoT está cobrando cada vez más importancia y es palpable viendo la cantidad de dispositivos ...
Article
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Intelligent containers based on a Low-Power sensor network and a Non-Invasive acquisition system for management and tracking of goods

Hidalgo Fort, Eduardo; García-Oya, José Ramón; Muñoz Chavero, Fernando; González Carvajal, Ramón (Institute of Electrical and Electronics Engineers (IEEE), 2018)
This paper presents a prototype of a system for intermodal freight transport with electronics management of goods. The ...
Article
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Passive RFID-Based Inventory of Traffic Signs on Roads and Urban Environments

García-Oya, José Ramón; Martín Clemente, Rubén; Hidalgo Fort, Eduardo; González Carvajal, Ramón; Muñoz Chavero, Fernando (MDPI, 2018)
This paper presents a system with location functionalities for the inventory of traffic signs based on passive RFID ...
Article
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Compact Embedded Wireless Sensor-Based Monitoring of Concrete Curing

Cabezas, Joaquín; Sánchez Rodríguez, Trinidad; Gómez Galán, Juan Antonio; Cifuentes-Bulté, Héctor; González Carvajal, Ramón (MDPI, 2018)
This work presents the design, construction and testing of a new embedded sensor system for monitoring concrete curing. A ...
Article
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An Op-Amp Approach for Bandpass VGAs With Constant Bandwidth

Pourashraf, Shirin; Ramírez Angulo, Jaime; López Martín, Antonio J.; González Carvajal, Ramón; Algueta Miguel, José María (IEEE (Institute of Electrical and Electronics Engineers), 2018)
Two approaches to implement variable gain amplifiers based on Miller op-amps are discussed. One has true constant bandwidth ...
Article
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CMOS First-Order All-Pass Filter With 2-Hz Pole Frequency

Paul, Anindita; Ramírez Angulo, Jaime; López Martín, Antonio J.; González Carvajal, Ramón (IEEE (Institute of Electrical and Electronics Engineers), 2018)
A CMOS fully integrated all-pass filter with an extremely low pole frequency of 2 Hz is introduced in this paper. It has ...
Article
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Super class AB RFC OTA with adaptive local common-mode feedback

Garde, M.P.; López Martín, A.J.; González Carvajal, Ramón; Ramírez Angulo, Jaime (IET (Institution of Engineering and Technology), 2018)
A super class AB recycling folded cascode operational transconductance amplifier is presented. It employs local common-mode ...
Article
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An Amplified Offset Compensation Scheme and its Application in a Track and Hold Circuit.

Pourashraf, Shirin; Ramírez Angulo, Jaime; Cabrera Galicia, Alfonso R.; López Martín, Antonio J.; González Carvajal, Ramón (IEEE (Institute of Electrical and Electronics Engineers), 2018)
This brief proposes a fully differential track and hold circuit using a new dc offset compensation scheme. It stores an ...
Article
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A Highly Efficient Composite Class-AB-AB Miller Op-Amp With High Gain and Stable From 15 pF Up To Very Large Capacitive Loads

Pourashraf, Shirin; Ramírez Angulo, Jaime; López Martín, Antonio J.; González Carvajal, Ramón (IEEE (Institute of Electrical and Electronics Engineers), 2018)
In this paper, a highly power-efficient class-AB–AB Miller op-amp is discussed. The structure uses gm enhancement based ...
Article
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Super class AB RFC OTA using nonlinear current mirrors

Garde, M.P.; López Martín, A.J.; González Carvajal, Ramón; Ramírez Angulo, Jaime (Institution of Engineering and Technology (IET), 2018)
An alternative approach to the design of super class AB recycling folded cascode operational transconductance amplifiers ...
Article
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High current efficiency classAB OTA with high open loop gain and enhanced bandwidth

Pourashraf, Shirin; Ramírez Angulo, Jaime; Román Loera, Alejandro; López Martín, Antonio J.; Díaz Sánchez, Alejandro; González Carvajal, Ramón (IEICE, 2017)
An efficient class-AB OTA with enhanced output current, slew rate, open loop gain, and gain bandwidth is presented. The ...
PhD Thesis
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Aportaciones al diseño de ADCs en tecnologías nanométricas y para entornos de alta radiación

Márquez Lasso, Fernando J.; Muñoz Chavero, Fernando; González Carvajal, Ramón (2015)
El trabajo presentado a lo largo de esta Tesis Doctoral está intrínsecamente relacionado con la evolución del diseño de ...
Presentation
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Smart Navigation System for the Port of Seville

Torralba Silgado, Antonio Jesús; Gutierrez-Rumbao, J.; Peral, J.M.; Daza Rebollo, David; Rodríguez-Serrano, A.; Hidalgo, E.; Gonzalez-Romo, J.M.; Castellano, M.; Collar, L.; Luján Martínez, Clara Isabel; Escudero Santana, Alejandro; Muñuzuri, Jesús; González Carvajal, Ramón (2015)
This paper focuses in the development of an information platform for rivers and integrated navigation aid system in ...
Presentation
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Smart ICTs for the enhancement of traffic logistics in the Port of Seville

Torralba Silgado, Antonio Jesús; Gutierrez-Rumbao, J.; Peral, J.M.; Daza Rebollo, David; Rodríguez-Serrano, A.; Hidalgo, E.; Gonzalez-Romo, J.M.; Castellano, M.; Collar, L.; Luján Martínez, Clara Isabel; Escudero Santana, Alejandro; Onieva, Luis; González Carvajal, Ramón (2015)
This paper focuses in the optimization of intermodal transport by the development of a freight geolocation and telecontrol ...
Article
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R&D spin-off models in Spain

Nowakowski M.; González Carvajal, Ramón (BazTech, 2013)
The recent years have seen increasing interest in the issues of technology transfer, as a result of which, in numerous ...
Patent. Invention
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Procedimiento y sistema para el inventariado de carreteras utilizando tecnología inalámbrica

Guerrero de Mier, Alfonso; González Carvajal, Ramón; Martín Clemente, Rubén; Hornillo Mellado, Susana; Muñoz Chavero, Fernando (Oficina Española de Patentes y Marcas (OEPM), 2012)
Sistema y método para el inventariado de carreteras utilizando tecnología inalámbrica, que comprende: (a) una pluralidad ...
Article
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Soluciones para la monitorización de trabajadores en obra mediante tecnologías inalámbricas

González Carvajal, Ramón; Pérez Mira, Ventura; Daza Rebollo, David; Carrillo-Castrillo, Jesús Antonio (2012)
La prevención activa puede implementar diferentes barreras de seguridad. El estado de la técnica de los sistemas de ...
PhD Thesis
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Diseño de convertidores A/D pipeline de baja tensión de alimentación y bajo consumo

Palomo Vázquez, Bernardo; Muñoz Chavero, Fernando; González Carvajal, Ramón (2012)
1.2 Objetivos ... Establecer las especificaciones que debe cumplir el prototipo para poder ser incluido en un front-end ...
Presentation
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A low-pass filter with automatic frequency tuning for a bluetooth receiver

Pedro, M.; Galán, J.; Sánchez Rodríguez, T.; Muñoz Chavero, Fernando; González Carvajal, Ramón; López Martín, A. (IEEE (Institute of Electrical and Electronics Engineers), 2011)
A third-order Gm-C Chebyshev low-pass filter with high linearity and automatic frequency programmability has been designed. ...
Presentation
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0.13-µm CMOS tunable transconductor based on the body-driven gain boosting technique with application in Gm-C filters

Sánchez Rodríguez, Trinidad; González Carvajal, Ramón; Pennisi, Salvatore; Gómez Galán, Juan Antonio (2011)
We present a low-voltage low-power CMOS tunable transconductor exploiting body gain boosting to increase the small-signal ...
Article
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Design of two-stage class AB CMOS buffers: a systematic approach

López Martín, Antonio; Algueta Algueta, José María; Acosta Cabanillas, Lucía; Ramírez Angulo, Jaime; González Carvajal, Ramón (2011)
A systematic approach for the design of two-stage class AB CMOS unity-gain buffers is proposed. It is based on the inclusion ...
Presentation
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CMOS operational amplifiers with continuous-time capacitive common mode feedback

Ramírez Angulo, Jaime; Nargis, Ayesha; González Carvajal, Ramón; López Martín, Antonio (2010)
A simple and power efficient approach for the implementation of continuous-time common mode feedback networks using a ...
Presentation
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Rail-to-rail class AB CMOS tunable transconductor with -52dB IM3 at 1MHz

Acosta Cabanillas, Lucía; López Martín, Antonio; González Carvajal, Ramón; Ramírez Angulo, Jaime (2009)
A novel CMOS tunable transconductor is presented. The circuit operates in classAB hence featuring power efficiency. The ...
Presentation
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Tunable class AB CMOS Gm-C channel filter for a bluetooth zero-IF receiver

García Alberdi, Coro; Acosta Cabanillas, Lucía; López Martín, Antonio; Ramírez Angulo, Jaime; González Carvajal, Ramón (2009)
A novel tunable third order low-pass Gm-C filter is introduced. Programmable transconductors operating in class AB have ...
Presentation
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New high performance second generation CMOS current conveyor

Marri, Swathi; Ramírez Angulo, Jaime; López Martín, Antonio; González Carvajal, Ramón (2009)
A new high performance second-generation CMOS current conveyor architecture is presented. It is built using a differential ...
Chapter of Book
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Low-power and low-voltage analog-to-digital converters for wearable EEG systems

García González, J. M.; López Morillo, Enrique; Muñoz Chavero, Fernando; El Gmili, Hakim; González Carvajal, Ramón (2009)
Article
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Low-voltage tunable pseudo-differential transconductor with high linearity

Gómez Galán, Juan Antonio; Pedro Carrasco, Manuel; Pennisi, Melitta; López Martín, Antonio; González Carvajal, Ramón; Ramírez Angulo, Jaime (2009)
A novel tunable transconductor is presented. Input transistors operate in the triode region to achieve programmable ...
Presentation
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A novel switched capacitor frequency tuning technique for continuous-time Gm-C filters

Sánchez Rodríguez, Trinidad; Muñoz Chavero, Fernando; Torralba Silgado, Antonio Jesús; González Carvajal, Ramón (2009)
A novel approach for the automatic frequency tuning of Continuous Time Filters is presented. This approach is based on a ...
Presentation
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Accurate dynamic-feedback CMOS cross-quad suitable for low-voltage operation

Calvo, Belén; López Martín, Antonio; Ramírez Angulo, Jaime; González Carvajal, Ramón (2009)
This paper presents the implementation of a crossquad circuit suitable for low-voltage operation. The proposed cell exploits ...
Presentation
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A tunable floating-gate CMOS transconductor based on current multiplication

Algueta Miguel, José M.; López Martín, Antonio; Ramírez Angulo, Jaime; González Carvajal, Ramón (2009)
In this paper a novel transconductor based on floating gate techniques that performs current multiplication for tuning ...
Patent. Invention
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Método para la realización de un amplificador de condensadores conmutados insensible a la rela ción entre las capacidades y al offset y ganancia de los amplificadores

Torralba Silgado, Antonio Jesús; Muñoz Chavero, Fernando; González Carvajal, Ramón; El Gmli, Hakim (Oficina Española de Patentes y Marcas (OEPM), 2008)
Método para la realización de un amplificador de conden sadores conmutados insensible a la relación entre las ca pacidades ...
Presentation
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Rail to Rail Fully Differential Track and Hold Based on Clocked Differential Difference Amplifier Using Resistive Local Common Mode Feedback

Ramírez Angulo, Jaime; Luján Martínez, Clara Isabel; Rubia Marcos, Carlos; González Carvajal, Ramón; López Martín, Antonio (2008)
An efficient clocked class AB fully differential rail to rail differential difference amplifier is introduced. It is based ...
Patent. Invention
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Método para la implementación de un amplificador de capacidades conmutadas insensible a la relación entre las capacidades y al offset de los amplificadores

Muñoz Chavero, Fernando; González Carvajal, Ramón; Torralba Silgado, Antonio Jesús; El Gmli, Hakim; Palomo Vázquez, Bernardo; Gómez Galán, Juan Antonio (Oficina Española de Patentes y Marcas (OEPM), 2007)
Método para la implementación de un amplificador de capacidades conmutadas insensible a la relación entre las capacidades ...
Presentation
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Low frequency, current mode programmable KHN filters using large-valued active resistors

Muñiz Montero, Carlos; González Carvajal, Ramón; Díaz Sánchez, Alejandro; Rocha, Miguel (2007)
The present work proposes a new current-mode, programmable Kerwin Huelsman Newcomb (KHN) filter suitable for very low ...
Presentation
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A very compact KHN filter with multidecade tuning

Muñiz Montero, Carlos; Díaz Sánchez, Alejandro; González Carvajal, Ramón (2007)
A very compact implementation of a multifunction Kerwin Huelsman Newcomb (KHN) filter that can be frequency tuned almost ...
Article
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Low-voltage wide gm adjustable range highly linear bicmos OTA

Ramírez Angulo, Jaime; Sawant, Milind S.; López Martín, Antonio; González Carvajal, Ramón (2005)
A low distortion low-voltage BiCMOS OTA with wide gm adjustment range and constant input range is presented. It is based ...
Article
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A true low voltage class-AB current mirror

Torralba Silgado, Antonio Jesús; González Carvajal, Ramón; Jiménez Fuentes, José Mariano; Muñoz Chavero, Fernando; Ramírez Angulo, Jaime (2005)
Class-AB circuits, which are able to deal with currents which are orders of magnitude larger than their quiescent current, ...
Presentation
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1.5V Rail-to-rail programmable-gain CMOS amplifier

Ramírez Angulo, Jaime; López Martín, Antonio J.; González Carvajal, Ramón; Lackey, C. (IEEE (Institute of Electrical and Electronics Engineers), 2004)
A 1.5V programmable-gain differential amplifier is implemented using a novel design technique for operating closed-loop ...
Article
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Biasing CMOS amplifiers using MOS transistors in subthreshold region

Bikumandla, Manoj; González Carvajal, Ramón; Ramírez Angulo, Jaime; Urquidi, Carlos; López Martín, Antonio (2004)
The implementation of large-valued floating resistive elements using MOS transistors in subthreshold region is addressed. ...
PhD Thesis
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Diseño de circuitos analógicos de baja tensión y bajo consumo empleando el seguidor de tensión FVF

Gómez Galán, Juan Antonio; González Carvajal, Ramón; Muñoz Chavero, Fernando (2003)
En los últimos años, el Grupo de Investigación de Tecnología Electrónica de la Universidad de Sevilla, ha desarrollado una ...
PhD Thesis
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Aportaciones al diseño de circuitos para comunicaciones de baja tensión de alimentación y bajo consumo

Muñoz Chavero, Fernando; Torralba Silgado, Antonio Jesús; González Carvajal, Ramón (2002)
Una de las líneas de investigación por el... En los últimos años los sistemas de comunicación han experimentado un avance ...
Presentation
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Design of a band-pass sigma-delta modulator with reduced number of opamps

Pérez Vega-Leal, Alfredo; Muñoz Chavero, Fernando; González Carvajal, Ramón; Torralba Silgado, Antonio Jesús; Tombs, J. N.; García Franquelo, Leopoldo (2000)
This paper is intended to compare the performance of a Band-Pass converter structure and its Low-Pass prototype 2nd order ...
Presentation
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CMOS fuzzifier using mixed-signal techniques with emphasis in power consumption

González Carvajal, Ramón; Torralba Silgado, Antonio Jesús; Colodro Ruiz, Francisco; García Franquelo, Leopoldo (1999)
A novel mixed-signal CMOS membership function generator (MFG) is presented. It is based on an enhanced version of a linear ...
PhD Thesis
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Contribuciones al diseño microelectrónico de controladores borrosos y neuronales automatización y realización

González Carvajal, Ramón; Torralba Silgado, Antonio Jesús (1999)
El objetivo de esta tesis es explorar diferentes alternativas para la realización de microelectrónica de sistemas borrosos ...
Presentation
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Stochastic and PWM coding for an efficient implementation of Cellular Neural Networks

Colodro Ruiz, Francisco; Torralba Silgado, Antonio Jesús; González Carvajal, Ramón; García Franquelo, Leopoldo (1997)
This paper present the application of Pulse Stream Tech-niques (PSTs) to the hardware implementation of a Cellular Neural ...
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An analog CMOS universal membership function circuit with fully independent, adjustable parameters

González Carvajal, Ramón; Torralba Silgado, Antonio Jesús; Colodro Ruiz, Francisco; García Franquelo, Leopoldo (1997)
A novel CMOS membership function circuit (MBC) is presented. It is based on a linear tunable transconductor proposed in ...
Presentation
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Automatic synthesis of analog fuzzy controllers

González Carvajal, Ramón; Torralba Silgado, Antonio Jesús; Colodro Ruiz, Francisco; García Franquelo, Leopoldo (1997)
In this paper, a silicon compiler for analog fuzzy controllers is presented. The layout is automatically generated ...
Presentation
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Digital test design with an "ad hoc" strategy for an industrial ASIC with large dimension

González Carvajal, Ramón; Aguirre Echanove, Miguel Ángel; Torralba Silgado, Antonio Jesús; García Franquelo, Leopoldo (1996)
The development of digital ASIC's with a large area states a lot of doubts when the ingenieer must design a test strategy. ...