Ara es mostren els items 1-20 de 107

  • 20/30 GHz front-end for the TMS-7 receiving station of the OLYMPUS satellite 

    Artal, E; Bará, J; Berenguer Sau, Jordi; Comerón Tejero, Adolfo; Corbella Sanahuja, Ignasi; Pradell i Cara, Lluís (1989)
    Text en actes de congrés
    Accés obert
    The authors present the 20/30-GHz front-end of the TMS-7 station for performing the measurement of the flux density of one or more signal carriers received from the OLYMPUS satellite. The front-end is composed of two ...
  • A general analysis of error in noise measurement systems 

    Pradell i Cara, Lluís; Comerón Tejero, Adolfo; Ramírez González, Alejandro (Institute of Electrical and Electronics Engineers (IEEE), 1988)
    Text en actes de congrés
    Accés obert
    General and approximated expressions are presented which allow the identification and quantification of errors in noise figure measurements that use the Y-factor method. This formulation is a generalization of that in /2/ ...
  • A highly-repeatable, broadband 180º phase switch for integrated MEMS processes 

    Llamas Morote, Marco Antonio; Girbau Sala, David; Ribó, M.; Pradell i Cara, Lluís; Giacomozzi, Flavio; Colpo, S.; Coccetti, Favio; Aouba, Stephane (2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    A broadband 0º/180º phase switch based on a slotline-coplanar-waveguide cross loaded with two MEMS switches in opposed (ON/OFF or OFF/ON) states, is reported. The fabrication was made on high-resistivity silicon substrates ...
  • A low-power-consumption out-of-Plane electrothermal actuator 

    Girbau Sala, David; Llamas Morote, Marco Antonio; Casals Terré, Jasmina; Simó Selvas, Francisco Javier; Pradell i Cara, Lluís; Lázaro Guillén, Antoni (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-06-30)
    Article
    Accés obert
    This paper proposes a new vertical electrothermal actuator. It can be considered as a hybrid between the traditional in-plane buckle-beam actuator and the vertical hot-cold actuator. It is here referred to as vertical ...
  • A method for characterizing coplanar waveguide-to-microstrip transitions, and its application to the measurement of microstrip devices with coplanar microprobes 

    Maya Sánchez, Mª del Carmen; Lázaro Guillén, Antoni; Pradell i Cara, Lluís; Paco, D. de (JOHN WILEY & SONS INC, 2003-12-31)
    Article
    Accés obert
    This paper presents a method for characterizing coplanar waveguide-to-microstrip (CPW-M) transitions by using on-wafer coplanar (CPW) microprobes. It is based on extracting the transmission matrix of the CPW-M transition ...
  • A Method for the Determination of a Distributed FET Noise-Model Based on Matched-Source Noise-Figure Measurements 

    Maya Sánchez, Mª del Carmen; Pradell i Cara, Lluís; Lázaro Guillén, Antoni (JOHN WILEY & SONS INC, 2004-05-31)
    Article
    Accés obert
    A new method for the determination of a distributed FET noise model is presented. It is based on the extraction of the intrinsic noise-correlation matrix of an elemental section of the device from the device's noise figure, ...
  • A Method to Simultaneously Extract the Small-Signal Equivalent Circuit and Noise Parameters of Heterojunction Bipolar Transistors 

    Maya Sánchez, Mª del Carmen; Lázaro Guillén, Antoni; Pradell i Cara, Lluís (JOHN WILEY & SONS INC, 2006-07-31)
    Article
    Accés obert
    A method to extract the elements of the small-signal equivalent circuit and the noise parameters (NPs) of heterojunction bipolar transistors (HBTs) is presented. The extraction is done by simultaneous fitting of the measured ...
  • A novel tunable multimodal bandpass filter 

    Contreras Lizarraga, Adrián Arturo; Pradell i Cara, Lluís; Ribó, M. (2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This paper presents a novel uniplanar tunable bandpass filter. In this filter, each resonator can be reconfigured easily using PIN diodes or MEMS switches. Design equations are derived from a simple circuit model which ...
  • A RF-MEMS switchable CPW air-bridge 

    Contreras, Adrián; Casals Terré, Jasmina; Pradell i Cara, Lluís; Giacomozzi, Flavio; Colpo, Sabrina; Iannacci, Jacopo; Ribó, Miquel (2012)
    Comunicació de congrés
    Accés obert
    This work presents a new shunt-type ohmic contact RF-MEMS switch specifically designed as a switchable CPW air bridge. The switch can be used in coplanar waveguide (CPW) reconfigurable multimodal circuits, for a selective ...
  • A very low distortion high efficiency class-F power amplifier at 900 MHz. 

    Gilasgar, Mitra; Barlabe Dalmau, Antoni; Pradell i Cara, Lluís (2013)
    Text en actes de congrés
    Accés obert
    This paper presents a novel class - F power amplifier for mobile applications in which with a proper harmonic tuning structure the need f or an extra fil tering section is eliminated . A class - F ...
  • A wideband detector for the 30 Ghz channel of the Planck mission low frequency instrument 

    Paco Sánchez, Pedro Antonio de; Lázaro Guillén, Antoni; Pradell i Cara, Lluís (GORDON BREACH SCI PUBL LTD, 2000-05-31)
    Article
    Accés obert
    Design considerations of a 30 GHz detector prototype for the Planck Low Frequency Instrument (LFI) are presented. A simple detector configuration based on a commercial Schottky diode is used, featuring a good linearity and ...
  • Advanced millimeter wave technology for mobile communications 

    Pradell i Cara, Lluís; Corbella Sanahuja, Ignasi; Comerón Tejero, Adolfo; Bará Temes, Francisco Javier; Artal, E.; Torres Torres, Francisco; Purroy, Francesc; Barlabe Dalmau, Antoni; Sales, V. (Institute of Electrical and Electronics Engineers (IEEE), 1993)
    Text en actes de congrés
    Accés obert
  • Amplificadores multietapa de bajo en las bandas de 20 y 30ghz 

    Artal, E; Corbella Sanahuja, Ignasi; Busquets, C; Pradell i Cara, Lluís (1989)
    Text en actes de congrés
    Accés obert
    Microstrip coupled lines technology has been used to design and built low noise amplifiers in 20 and 30 GHz bands. Active devices are GaAs MESFET and HEMT in chip form. The amplifiers have input and output waveguide ...
  • Analytical energy model for the dynamic behavior of RF MEMS switches under increased actuation voltage 

    Casals Terré, Jasmina; Llamas, Marco Antonio; Girbau Sala, David; Pradell i Cara, Lluís; Lázaro Guillén, Antonio; Giacomozzi, Flavio; Colpo, Sabrina (2014-12-01)
    Article
    Accés restringit per política de l'editorial
    In this paper, the dynamic behavior of electrostatically actuated radio frequency-microelectromechanical system (RF-MEMS) switches is analyzed using energy considerations. An analytical model for bridge-type RF-MEMS switches ...
  • Análisis de errores en sistemas de medida de ruido. Sistema de medida de parámetros de ruido de transistores de microondas 

    Pradell i Cara, Lluís; Comerón Tejero, Adolfo; Ramírez Marín, A.; Martorell, Jm (Universidad Politécnica de Madrid (UPM), 1988)
    Text en actes de congrés
    Accés obert
  • Application of CAD load-pull techniques in mixer design 

    Velázquez, A.; Lázaro Guillén, Antoni; Pradell i Cara, Lluís; Comerón Tejero, Adolfo (2003-02)
    Article
    Accés obert
    This work describes the application of a commercial CAD software to implement load-pull techniques in the design of microwave mixers. This method is used to generate conversion-loss regions when a diode is pumped and ...
  • Application of CAD load_pull techniques in mixer design 

    Velázquez, A.; Lázaro Guillén, Antoni; Pradell i Cara, Lluís; Comerón Tejero, Adolfo (JOHN WILEY & SONS INC, 2003-02-28)
    Article
    Accés obert
    This work describes the application of a commercial CAD software to implement load-pull techniques in the design of microwave mixers. This method is used to generate conversion-loss regions when a diode is pumped and ...
  • Automatización de la caracterización de transistores MESFET de microondas 

    Pradell i Cara, Lluís (Universidad de Málaga, 1992)
    Text en actes de congrés
    Accés obert
  • Banco automatizado para la medida de parámetros S, de ruido y características DC de transistores en oblea 

    Pradell i Cara, Lluís; Purroy, Francesc; Subirats, M.; Ballester, A.; Torres Torres, Francisco; O'Callaghan Castellà, Juan Manuel; Corbella Sanahuja, Ignasi (1994)
    Text en actes de congrés
    Accés obert
    The AMR Group has an automatized bench for the measurement of DC-characteristics, [S] parameters (45 MHz- 40 GHz) and noise parameters (2-26.5 GHz) of microwave on-wafer transistors. The hardware configuration is described, ...
  • Bias-dependence of FET intrinsic noise sources, determined with a quasi-2D model 

    Lázaro Guillén, Antoni; Maya Sánchez, Mª del Carmen; Pradell i Cara, Lluís (JOHN WILEY & SONS INC, 2003-11-30)
    Article
    Accés obert
    The bias-dependence of microwave-FET intrinsic noise sources in their hybrid configuration is theoretically determined, using a new quasi-2D (Q-2D) physical model based on Thornber's current equation [8]. It is shown that ...