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

    63

  • No. visits

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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, 2022-09-01)
A high performance bulk-driven rail-to-rail fully differential buffer operating from ±0.3V supplies in 180 nm CMOS technology ...
Final Degree Project
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Diseño y desarrollo de un sistema de precintado remoto sobre FreeRTOS para sistemas IoT

González Carvajal, Ramón; Hidalgo Fort, Eduardo; Vivancos Porras, Carmen (2022-01-01)
Las comunicaciones inalámbricas, han experimentado una gran expansión en los últimos años en nuestras vidas y se hace casi ...
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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, 2022-01-01)
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

González Carvajal, Ramón; Martín Clemente, Rubén; Martín Romero, Manuel (2022-01-01)
Con la llegada de la denominada Industria 4.0 comienza a haber una demanda por sistemas de visión e inferencia basados en ...
Master's Final Project
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Metrics system

González Carvajal, Ramón; Girona García, Rafael; Neira Jaén, Daniel (2022-01-01)
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., 2021-04-12)
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, 2021-04-01)
Energy efficiency is a key requirement in the design of amplifiers for modern wireless applications. The use of quasi-floating ...
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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., 2021-01-01)
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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Estudio de la arquitectura DDS y diseño de una solución aplicada sobre arquitectura genérica de vehículos

González Carvajal, Ramón; Hidalgo Fort, Eduardo; Pajuelo Durán, Rafael (2021-01-01)
En este proyecto se pretende establecer una red de comunicaciones en el entorno de un vehículo genérico, basado en tecnologías ...
Final Degree Project
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Diseño y desarrollo de un driver de control para la estación SPS30 y su integración en FreeRTOS

González Carvajal, Ramón; Hidalgo Fort, Eduardo; Barba Lozano, Pedro (2021-01-01)
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 un HUB Wireless M-Bus-NbIoT

González Carvajal, Ramón; Ávila Soriano, Alberto (2021-01-01)
El agua es un recurso indispensable para la vida en nuestro planeta y para la gran mayoría de las actividades económicas ...
Final Degree Project
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Instrumentación inteligente no invasiva para procesos en ganadería y agricultura

González Carvajal, Ramón; Prieto Ferrer, Miguel Ángel (2021-01-01)
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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Diseño de etapas amplificadoras de bajo consumo para señales ultrasónicas

González Carvajal, Ramón; Bravo Salguero, Esther María (2021-01-01)
Las señales ultrasónicas o ultrasonidos son una serie de ondas mecánicas, normalmente longitudinales, cuya frecuencia está ...
Master's Final Project
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Creación de una herramienta basada en datos reales obtenidos por telemetría para la electrificación de flotas

González Carvajal, Ramón; Robles López, Celia (2021-01-01)
La transición hacia una movilidad eléctrica es uno de los objetivos mundiales en la lucha contra el cambio climático y la ...
Final Degree Project
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Desarrollo firmware de un driver de control para el módulo Sigfox AX-SF10 ANT21-868

González Carvajal, Ramón; Hidalgo Fort, Eduardo; Delgado Venzalá, María del Carmen (2021-01-01)
El trabajo que leerá a continuación presenta el desarrollo firmware de un sistema inalámbrico, cuya funcionalidad será ...
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), 2020-06-01)
A CMOS low-voltage amplifier with approximately constant bandwidth and DC rejection is introduced. The design is based on ...
PhD Thesis
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Internet of Things en sistemas de monitorización inteligente con aplicación en transporte e infraestructuras

Muñoz Chavero, Fernando; González Carvajal, Ramón; García-Oya, José Ramón; Hidalgo Fort, Eduardo (2020-02-21)
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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, 2020-01-01)
A technique to implement true-sample-and-hold circuits that hold the output for almost the entire clock cycle without ...
Final Degree Project
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Diseño de tests unitarios para el TWR-KM34Z50M

González Carvajal, Ramón; Girona García, Rafael; Neira Jaén, Daniel (2020-01-01)
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

González Carvajal, Ramón; López Flores, Pablo (2020-01-01)
The objective of this project was defined as the design and implementation of a drone quadcoper using low cost microcontrollers. As ...
Final Degree Project
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Desarrollo de soluciones IoT con Mbed

González Carvajal, Ramón; Salvador Vázquez, José Manuel (2019-01-01)
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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±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), 2019-01-01)
Reduction of minimum supply requirements is a crucial aspect to decrease the power consumption in VLSI systems. A ...
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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, 2018-07-01)
This paper presents a system with location functionalities for the inventory of traffic signs based on passive RFID ...
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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, 2018-03-15)
This work presents the design, construction and testing of a new embedded sensor system for monitoring concrete curing. A ...
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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), 2018-01-01)
Two approaches to implement variable gain amplifiers based on Miller op-amps are discussed. One has true constant bandwidth ...
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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), 2018-01-01)
This brief proposes a fully differential track and hold circuit using a new dc offset compensation scheme. It stores an ...
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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), 2018-01-01)
A CMOS fully integrated all-pass filter with an extremely low pole frequency of 2 Hz is introduced in this paper. It has ...
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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), 2018-01-01)
In this paper, a highly power-efficient class-AB–AB Miller op-amp is discussed. The structure uses gm enhancement based ...
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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; Rámirez Angulo, J. (IET (Institution of Engineering and Technology), 2018-01-01)
A super class AB recycling folded cascode operational transconductance amplifier is presented. It employs local common-mode ...
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), 2018-01-01)
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, 2017-01-01)
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

Muñoz Chavero, Fernando; González Carvajal, Ramón; Márquez Lasso, Fernando J. (2015-11-30)
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 (2015-09-01)
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 (2015-09-01)
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, 2013-01-01)
The recent years have seen increasing interest in the issues of technology transfer, as a result of which, in numerous ...
PhD Thesis
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Diseño de convertidores A/D pipeline de baja tensión de alimentación y bajo consumo

Muñoz Chavero, Fernando; González Carvajal, Ramón; Palomo Vázquez, Bernardo (2012-01-01)
1.2 Objetivos ... Establecer las especificaciones que debe cumplir el prototipo para poder ser incluido en un front-end ...
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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 (2012-01-01)
La prevención activa puede implementar diferentes barreras de seguridad. El estado de la técnica de los sistemas de ...
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 (2011-01-01)
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 (2011-01-01)
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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A low-pass filter with automatic frequency tuning for a bluetooth receiver

Pedro Carrasco, Manuel; Gómez Galán, Juan Antonio; Sánchez Rodríguez, Trinidad; Muñoz Chavero, Fernando; González Carvajal, Ramón; López Martín, Antonio (2010-01-01)
A third-order Gm-C Chebyshev low-pass filter with high linearity and automatic frequency programmability has been designed. ...
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 (2010-01-01)
A simple and power efficient approach for the implementation of continuous-time common mode feedback networks using 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 (2009-01-01)
This paper presents the implementation of a crossquad circuit suitable for low-voltage operation. The proposed cell exploits ...
Presentation
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New high performance second generation CMOS current conveyor

Marri, Swathi; Ramírez Angulo, Jaime; López Martín, Antonio; González Carvajal, Ramón (2009-01-01)
A new high performance second-generation CMOS current conveyor architecture is presented. It is built using a differential ...
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 (2009-01-01)
A novel tunable transconductor is presented. Input transistors operate in the triode region to achieve programmable ...
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 (2009-01-01)
A novel CMOS tunable transconductor is presented. The circuit operates in classAB hence featuring power efficiency. The ...
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 (2009-01-01)
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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A tunable floating-gate CMOS transconductor based on current multiplication

Algueta Miguel, José M.; López Martín, Antonio; Ramírez Angulo, Jaime; González Carvajal, Ramón (2009-01-01)
In this paper a novel transconductor based on floating gate techniques that performs current multiplication for tuning ...
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 (2009-01-01)
A novel tunable third order low-pass Gm-C filter is introduced. Programmable transconductors operating in class AB have ...
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 (2009-01-01)
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 (2007-01-01)
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 (2007-01-01)
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 (2005-01-01)
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 (2005-01-01)
Class-AB circuits, which are able to deal with currents which are orders of magnitude larger than their quiescent current, ...
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 (2004-01-01)
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

González Carvajal, Ramón; Muñoz Chavero, Fernando; Gómez Galán, Juan Antonio (2003-01-01)
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

Torralba Silgado, Antonio Jesús; González Carvajal, Ramón; Muñoz Chavero, Fernando (2002-01-01)
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 (2000-01-01)
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 (1999-01-01)
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

Torralba Silgado, Antonio Jesús; González Carvajal, Ramón (1999-01-01)
El objetivo de esta tesis es explorar diferentes alternativas para la realización de microelectrónica de sistemas borrosos ...
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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 (1997-01-01)
This paper present the application of Pulse Stream Tech-niques (PSTs) to the hardware implementation of a Cellular Neural ...
Presentation
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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 (1997-01-01)
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 (1997-01-01)
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 (1996-01-01)
The development of digital ASIC's with a large area states a lot of doubts when the ingenieer must design a test strategy. ...