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Ara es mostren els items 105-124 de 146

    • Measurement of on-wafer transistor noise parameters without a tuner using unrestricted noise sources 

      Lázaro Guillén, Antoni; Maya Sánchez, Mª del Carmen; Pradell i Cara, Lluís (HORIZON HOUSE PUBLICATIONS INC, 2002-03-31)
      Article
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      The authors present a method for calibrating the four noise parameters of a noise receiver which does not require a tuner The method permits using general (mismatched) noise sources, which may present very different source ...

    • Medida de parámetros de ruido de transistores HEMT a partir de medidas de ruido con fuente adapatada 

      Lázaro Guillén, Antoni; Pradell i Cara, Lluís; O'Callaghan Castellà, Juan Manuel; Pérez Pueyo, Rosanna; Soneira Ferrando, M. José (1998)
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    • Medida de parámetros S de transistores chip hasta 40 ghz utilizando calibración TRL 

      Pradell i Cara, Lluís; Sabater, C.; Artal, E.; Comerón Tejero, Adolfo; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Fortuny, J. (1990)
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    • Method for measuring noise parameters of microwave two-port 

      Lázaro Guillén, Antoni; Pradell i Cara, Lluís; O'Callaghan Castellà, Juan Manuel (IEE, 1998-06-30)
      Article
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      A new tuner-based method for measuring the four noise-parameters of a two-port is proposed. It makes use of a novel measurement ratio that includes noise powers and mismatch factors simultaneously. In contrast to previous ...

    • Method for measuring noise parameters of microwave two-port 

      Lázaro Guillén, Antoni; Pradell i Cara, Lluís; O'Callaghan Castellà, Juan Manuel (Institution of Electrical Engineers, 1998-06)
      Article
      Accés obert
      A new tuner-based method for measuring the four noise-parameters of a two-port is proposed. It makes use of a novel measurement ratio that includes noise powers and mismatch factors simultaneously. In contrast to previous ...

    • Método para la determinación de los parámetros de ruido a partir de medidas precisas de factor de ruido y parámetros S 

      Borràs, S.; Pradell i Cara, Lluís; Comerón Tejero, Adolfo; Artal, E. (1990)
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    • Método simplificado de extracción de las resistencias parásitas de MESFET's 

      Lanero, J M; Purroy, F; Lázaro Guillén, Antoni; Pradell i Cara, Lluís (J.M. PÁEZ BORRALLO, J.I. ALONSO MONTES SERVICIO PUBLICACIONES ETSIT - MADRID, 1996)
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    • Microstrip-fed 3D-printed H-sectorial horn phased array 

      Zhou, Ivan; Pradell i Cara, Lluís; López Villegas, José María; Vidal Martínez, Neus; Albert Gali, Miquel; Jofre Roca, Lluís; Romeu Robert, Jordi (Multidisciplinary Digital Publishing Institute (MDPI), 2022-07-16)
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      A 3D-printed phased array consisting of four H-Sectorial horn antennas of 200 g weight with an ultra-wideband rectangular-waveguide-to-microstrip-line transition operating over the whole LMDS and K bands (24.25–29.5 GHz) ...

    • Miniature switchable millimeter-wave BiCMOS low-noise amplifier at 120/140 GHz using an HBT switch 

      Heredia, F.-Javier (Francisco Javier); Ribó Pal, Miquel; Pradell i Cara, Lluís; Wipf, Selin Tolunay; Göritz, Alexander; Wietstruck, Matthias; Wipf, Christian; Kaynak, Mehmet (2019-10-01)
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      A 120–140 GHz frequency-switchable, very compact low-noise amplifier (LNA) fabricated in a 0.13 µm SiGe:C BiCMOS technology is proposed. A single radio-frequency (RF) switch composed of three parallel hetero junction bipolar ...

    • Modelado circuital multimodal de un resonador pasobanda reconfigurable 

      Contreras Lizarraga, Adrián Arturo; Ribó, Miquel; Pradell i Cara, Lluís (2010)
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      In this work, we present a simple uniplanar bandpass resonator that can be used for the development of reconfigurable uniplanar filters. The multimodal behaviour of the coplanar waveguide is taken into account for the ...

    • Modelado físico de transistores MESFET y HEMT 

      Lázaro, A; Pradell i Cara, Lluís; Torres Torres, Francisco (1994)
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      Models are developed for the de I-V curves and microwave small-signal parameters of the GaAs MESFET and HEMT. In the first step, the concept of a local small-signal equivalent circuit is introduced. In the second step, a ...

    • Modelo de transistores MESFET en régimen no lineal 

      Corbella Sanahuja, Ignasi; Legido, Jm; Pradell i Cara, Lluís (1989)
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    • Modelos físicos y técnicas de medida de ruido de transistores MESFETS y HEMT a frecuencias de microondas 

      Pradell i Cara, Lluís; Purroy, Francesc; O'Callaghan Castellà, Juan Manuel (1996)
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    • Modulador BPSK a 60 GHz en reflexión en guía de onda 

      Pradell i Cara, Lluís (Universidad de Málaga, 1992)
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    • Multiplicadores de frecuencia para receptores coherentes de microondas 

      Corbella Sanahuja, Ignasi; Berenguer Sau, Jordi; Pradell i Cara, Lluís; Comerón Tejero, Adolfo; Bará, J; Artal, E (1986)
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      The design of frequency multipliers using PLL techniques is presented in this article. The theory is dicussed and also experimental results of a x43 frequency multiplier with an output frequency of 11.4 GHz in wich excellent ...

    • New Theoretical Analysis of the LRRM Calibration Technique for Vector Network Analyzers 

      Purroy Martín, Francesc; Pradell i Cara, Lluís (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-10-31)
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      In this paper, a new theoretical analysis of the four-standards line-reflect-reflect-match (LRRM) vector network-analyzer (VNA) calibration technique is presented. As a result, it is shown that the reference-impedance (to ...

    • Noise model of a reverse-biased Cold-FET applied to the characterization of its ENR 

      Maya Sánchez, Mª del Carmen; Lázaro Guillén, Antoni; Pradell i Cara, Lluís (JOHN WILEY & SONS INC, 2004-02-28)
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      This paper presents a broadband-noise circuit model for a cold-FET (Vds = 0 V) with a reverse-biased gate. The noise model includes two intrinsic uncorrelated noise-current sources whose spectral densities are determined ...

    • Nonlinear actuation model for lateral electrostatically-actuated DC-contact RF MEMS series switches. 

      Lázaro Guillén, Antoni; Girbau Sala, David; Pradell i Cara, Lluís; Nebot Serra, Àlvar (JOHN WILEY & SONS INC, 2007-06-01)
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      In this work, a nonlinear model to predict actuation characteristics in lateral electrostatically-actuated DC-contact MEMS switches is proposed. In this case a parallel-plate approximation cannot be applied. The model ...

    • Planck pre-launch status: the planck mission 

      Tauber, Jan A.; Mandolesi, Nazzareno; Pujet, J.L.; Banos, T.; Bersanelli, Marco; Bouchet, R.C.; Butler, Chris; Charra, J.; Crone, Gerald; Dodsworth, John; Efstathiou, George; Gispert, Richard; Guyot, Guy; Gregorio, A.; Juillet, J. J.; Lamarre, J. M.; Laureijs, R. J.; Lawrence, C. R.; Nørgaard-Nielsen, H. U.; Passvogel, T.; Reix, J. M.; Texier, D.; Pradell i Cara, Lluís; Vibert, L.; Zacchei, A.; Ade, P.A.R; Aghanim, N.; Aja Abelán, Beatriz; Alippi, E.; Aloy, L.; Armand, P.; Arnaud, M.; Arondel, A.; Arreola-Villanueva, A.; Artal Latorre, Eduardo; Artina, E.; Arts, A.; Ashdown, M.; Ashdown, M.; Aumont, J.; Azzaro, M.; Bacchetta, A.; Baccigalupi, C.; Baker, M.; Balasini, M.; Balbi, A.; Banday, A.J.; Barbier, G.; Barreiro Vilas, Rita Belén; Bartelmann, M.; Battaglia, P.; Battaner, E.; Benabed, K.; Beney, J. L.; Beneyton, R.; Bennett, K.; Benoit, A.; Bernard, J. P.; Bhandari, P.; Bhatia, R.; Biggi, M.; Biggins, R.; Billig, G.; Blanc, Y.; Blavot, H.; Bock, J. J.; Bonaldi, A.; Bond, R.; Bonis, J.; Borders, J.; Borrill, J.; Boschini, L.; Boulanger, F.; Bouvier, J.; Bouzit, M.; Bowman, R.; Bréelle, E.; Bradshaw, T.; Braghin, M.; Bremer, M.; Brienza, D.; Broszkiewicz, D.; Burigana, C.; Burkhalter, M.; Cabella, P.; Cafferty, T.; Cairola, M.; Cairola, M.; Caminade, S.; Camus, P.; Cantalupo, C. M.; Cappellini, B.; Cardoso, J. F.; Carr, R.; Catalano, A.; Cayón, L.; Cesa, M.; Chaigneau, M.; Challinor, A. (EDP Sciences, 2010-09-15)
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      The European Space Agency's Planck satellite, launched on 14 May 2009, is the third-generation space experiment in the field of cosmic microwave background (CMB) research. It will image the anisotropies of the CMB over the ...

    • Planck-LFI 44-GHz back end module 

      Aja, Beatriz; Pascual, Juan Pablo; Fuente, Luisa de la; Detratti, M.; Artal Latorre, Eduardo; Mediavilla, Asier; Paco Sánchez, Pedro Antonio de; Pradell i Cara, Lluís (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-10-31)
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      This work describes the principle of operation, assembly and performance of one branch of the 44 GHz back end module (BEM) for the Planck low frequency instrument (LFI). This subsystem constitutes a fully representative ...