Ara es mostren els items 1-20 de 43

  • AC-coupled front-end for biopotential measurements 

    Spinelli, Enrique M.; Mayosky, Miguel Ángel; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2003-03)
    Article
    Accés obert
    AC coupling is essential in biopotential measurements. Electrode offset potentials can be several orders of magnitude larger than the amplitudes of the biological signals of interest, thus limiting the admissible gain of ...
  • A comprehensive model for power line interference in biopotential measurements 

    Fernández Chimeno, Mireya; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2000-06-30)
    Article
    Accés obert
    Power line interference is a major problem in high-resolution biopotential measurements. Because interference coupling is mostly capacitive, shielding electrode leads and a high common-mode rejection ratio (CMRR) are ...
  • Active inductor-based tunable impedance matching network for RF power amplifier application 

    Saberkari, Alireza; Ziabakhsh, Saman; Martínez García, Herminio; Alarcón Cot, Eduardo José (2015-08)
    Article
    Accés obert
    This paper presents the use of a new structure of active inductor named cascoded flipped-active inductor (CASFAI) in a T-type high-pass tunable output matching network of a class-E RF power amplifier (RFPA) to control the ...
  • A discrete-time technique for the steady-state analysis of nonlinear class-E amplifiers 

    Águila López, Francisco del; Palà Schönwälder, Pere; Molina Gaudó, Pilar; Mediano Heredia, Arturo (Institute of Electrical and Electronics Engineers (IEEE), 2007-06-11)
    Article
    Accés obert
    Switched circuits are widely used, particularly for power electronic applications in which efficiency is important. Of these applications, the class-E amplifier has been given particular attention, since it is theoretically ...
  • Amplificador conmutado con asistencia lineal por derivación de corriente mediante modulación de impedancia 

    Ruiz de La Iglesia, Anselmo Gonzalo (Universitat Politècnica de Catalunya, 2013-12-10)
    Treball Final de Grau
    Accés obert
    [ANGLÈS] This work has as main objective the study of the shunt current regulation technique in the Boost DC-DC converter. The design of a theoretical and a simulation model to analyze the behavior of the circuit and obtain ...
  • Amplificador de RF. Alimentació i protecció 

    Ubeda Font, Jordi (Universitat Politècnica de Catalunya, 2006)
    Projecte/Treball Final de Carrera
    Accés restringit per decisió de l'autor
    Aquest projecte pretén dotar d’alimentació i protecció a una etapa amplificadora de RF, Per fer-ho s’ha dissenyat i muntat una font d’alimentació a mida que a més d’incorporar les típiques etapes de rectificació, filtrat ...
  • Amplificador Wi-fi 

    Fernandez Ducable, Didac (Universitat Politècnica de Catalunya, 2008-02)
    Projecte/Treball Final de Carrera
    Accés restringit per decisió de l'autor
    Este trabajo explica detalladamente el proceso de fabricación de un circuito de Microondas, es decir; que opera a altas frecuencias. En él, se ha detallado específicamente todos los pasos que se deben dar para que dicho ...
  • An improved buffer for bioelectric signals 

    Pallàs Areny, Ramon; Colominas i Balagué, Josep; Rosell Ferrer, Francisco Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1989-04-01)
    Article
    Accés obert
    We propose an AC-coupled amplifier that offers a high in-put impedance, thus making it suitable for bioelectric signal amplifi- cation. We also present the necessary formulas for calculating its input impedance and transfer ...
  • A novel fully differential biopotential amplifier with DC suppression 

    Spinelli, Enrique M.; Martínez, Nolberto; Mayosky, Miguel Ángel; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2004-08)
    Article
    Accés obert
    Fully differential amplifiers yield large differential gains and also high common mode rejection ratio (CMRR), provided they do not include any unmatched grounded component. In biopotential measurements, however, the ...
  • Aplicació de la lògica difusa a un algoritme LMS en un entorn FPGA 

    Pertegal Miranda, David (Universitat Politècnica de Catalunya, 2008-11-12)
    Projecte/Treball Final de Carrera
    Accés obert
    Aquest treball fi de carrera presenta el disseny i desenvolupament d’un algoritme de lògica difusa que té per objectiu millorar l’adaptació d’un sistema de linealització basat en tècniques de predistorsió (PD) digital. Aquest ...
  • A practical approach to electrode-skin impedance unbalance measurement 

    Spinelli, Enrique M.; Mayosky, Miguel Ángel; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2006-07)
    Article
    Accés obert
    Unbalance between electrode-skin impedances is a major problem in biopotential recordings, leading to increased power-line interference. This paper proposes a simple, direct method to measure that unbalance at power-line ...
  • Banco de pruebas de comuniciones en banda L 

    Morales Bustos, Mª Lourdes (Universitat Politècnica de Catalunya, 2012-11-30)
    Treball Final de Grau
    Accés obert
    In this Thesis work an analysis has been carried out about the subject 'Enginyeria de RF' which is included in the curriculum of the 'Grado in Ingeniería de Sistemas de Comunicación of the Escola d'Enginyeria de Telecomunicació ...
  • Caracterización de dos amplificadores clase E para un transmisor LINC @ 900 MHz 

    Fernandez Vega, Carlos (Universitat Politècnica de Catalunya, 2012-11-27)
    Treball Final de Grau
    Accés obert
    The ISM band is an unlicensed band generally used in environmental studies, scientific and medical. The law depends to the government of each country. This study has focused on the European level to the frequency of 868 ...
  • Caracterización experimental de un amplificador optico de fibra dopada ER3+: Presentaciones en sistemas de transmisión coherente 

    Guitart Felip, Jorge; Ruiz Moreno, Sergio (1991)
    Text en actes de congrés
    Accés obert
    In this communication we present an experimental characterization of an Er3+ -doped fiber amplifier. This kind of amplifier shows high gain and large bandwidth that can be very useful in improving performances of wide band ...
  • Characterization and modelling of EMI susceptibility in integrated circuits at high frequency 

    Gil Galí, Ignacio; Fernández García, Raúl (2012)
    Comunicació de congrés
    Accés obert
    In this paper an alternative method for characterizing and modelling the EMI susceptibility in integrated circuits at frequencies above 1 GHz is presented. The PCB layout design is focused on the optimization of the ...
  • Compensation of impedance meters when using an external front-end amplifier 

    Torrents Dolz, Josep M.; Pallàs Areny, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-04-30)
    Article
    Accés obert
    Four-terminal impedance meters based on pseudo-bridges yield unexpected uncertainties when using high-contact-impedance electrodes. Adding a front-end amplifier to the impedance meter and rearranging the connection of the ...
  • Continuous-time CMOS adaptive asynchronous sigma-delta modulator approximating low-fs low-inband-error on-chip wideband power amplifier 

    Alarcón Cot, Eduardo José; Fernández, Diego; García Tormo, Albert; Madrenas Boadas, Jordi; Poveda López, Alberto (IEEE, 2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    A mixed-signal continuous-time-processing standard CMOS implementation of an asynchronous sigma-delta modulator aimed to drive a switching amplifier operating as an on-chip wideband adaptive power supply is presented in ...
  • Control automático de nivel (ALC) de un SSPA en banda Ka 

    Corbella Sanahuja, Ignasi; Purroy Martín, Francesc (1991)
    Text en actes de congrés
    Accés obert
    This communication describes the design of an Automatic Level Control (ALC) for the transmiter of a CODE (Co-operative Olympus Data Experiment) earth station. The goal of the ALC system is to keep constant the transmited ...
  • Design of a remote instrumentation system and a dedicated circuit for the configuration and quality analysis of rf power amplifiers 

    Pradas Barro, Marc (Universitat Politècnica de Catalunya, 2017-01)
    Treball Final de Grau
    Accés obert
    The author was working at the Tryo Communications in the i+d department, after some analysis of the fabrication procedures a lag of automation in a specific configuration process for powers amplifiers was detected. After ...
  • Design of CMOS Active Inductors and their use in tuned narrowband and wideband-extension Low Noise Amplifier 

    Rohan Suresh, Dhuri (Universitat Politècnica de Catalunya, 2014-06)
    Treball Final de Grau
    Accés obert
    The evolution of CMOS technology has allowed the integration of communication systems on a single chip. A Low-Noise Amplifier (LNA) is the first block in an integrated receiver and its design is critical for the system ...