Browsing by Subject "Amplifiers"

Now showing items 1-17 of 17

    • A nonlinear time-varying map of a buck power-switching amplifier for wide band tracking applications 

      El Aroudi, Abdelali; Alarcón Cot, Eduardo José; Rodríguez Vilamitjana, Enric; Leyva Grasa, Ramon (Emerald, 2010)
      Article
      Restricted access - publisher's policy
      Purpose The purpose of this paper is to characterize the nonlinear dynamical behaviour of a buck-based power-switching amplifier controlled by fixed frequency and pulse width modulation with a proportional-integral ...

    • Amping up, saving power 

      López Bueno, David; Wang, Teng; Gilabert Pinal, Pere Lluís; Montoro López, Gabriel (2016-01-01)
      Article
      Open Access
      Fourth-generation (4G) communication systems based on orthogonal frequency division multiplexing (OFDM) and the proposed backwards compatible fifth-generation (5G) variants, like filter-bank multicarrier (FBMC), are based ...

    • Amplificador d'alta freqüència amb tecnologia mesfet 

      Zapater Guilera, Antonio (Universitat Politècnica de Catalunya, 2007-01)
      Master thesis (pre-Bologna period)
      Restricted access - author's decision
      Hem construït amb dispositius MESFET dos amplificadors d'alta freqüència (10MHz a 1GHz), d'una potència considerable (P 1dB = 25dBm) i d'un guany elevat (G =25 dB). Per aconseguir-ho, primer hem hagut de resoldre les ...

    • 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
      Open Access
      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 ...

    • Common mode feedback analysis for EIT systems with distributed current sources 

      Antón Cardona, Daniel; Riu Costa, Pere Joan (2010)
      Conference report
      Open Access
      The use of differential voltage measurements is widely used in EIT instruments. Instrumentation amplifiers are always affected by common mode voltages at their input. These voltages may have different origins, being 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
      Open Access
      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 ...

    • Control theory applied to the design of AGC circuits 

      Bertran Albertí, Eduardo; Palacin, J M (1991)
      Conference report
      Open Access
      Applications of control theory in the design of automatic gain control (AGC) circuits are presented. A general model for AGC circuits is presented, and an equivalent linear system is proposed. Its behavior is compared with ...

    • Development of a reference signal source to verify electromagnetic emissions test benches 

      Tamborero Albà, Arnau (Universitat Politècnica de Catalunya, 2020-08)
      Bachelor thesis
      Open Access
      Electromagnetic Compatibility (EMC) laboratories must ensure the quality of the tests they perform. In this regard, periodic calibrations and internal verifications should be carried out systematically to provide evidence ...

    • Diseño de un amplificador de audio en clase D 

      Jiménez Torrejón, Óscar (Universitat Politècnica de Catalunya, 2018-10-24)
      Bachelor thesis
      Open Access
      Este trabajo recoge el proceso de diseño para un amplificador de audio en clase D. Los primeros apartados realizan una introducción a las diferentes clases de amplificadores de audio más presentes hoy en día. Tras esta ...

    • Disseny i implementació d'un amplificador basat en vàlvules per a aplicacions d'àudio 

      Molina Barcons, Albert (Universitat Politècnica de Catalunya, 2013-06-10)
      Bachelor thesis
      Restricted access - author's decision
      Aquest projecte consisteix en el disseny complet d’un amplificador de guitarra elèctrica basat en vàlvules de buit. Les vàlvules de buit són elements electrònics que han perdut molta presència des de l’aparició del ...

    • Disseny i simulació de un amplificador integrat per aplicacions de senyals neuronal 

      Sillero Tocavents, David (Universitat Politècnica de Catalunya, 2016-01-11)
      Bachelor thesis
      Open Access
      El propòsit d’aquest projecte es el disseny i simulació d’un amplificador de tensió de baix soroll i baixa potencia per aplicacions d’amplificació de senyals neuronals. El treball consistirà en fer un estudi, disseny i ...

    • Evaluation of trr distorting effects reduction in DCI-NPC multilevel power amplifiers by using SiC diodes and MOSFET technologies 

      Sala Caselles, Vicenç; Resano, Tomas; Romeral Martínez, José Luis; Moreno Eguilaz, Juan Manuel (Curran, 2013)
      Conference report
      Restricted access - publisher's policy
      In the last decade, the Power Amplifier applications have used multilevel diode-clamped-inverter or neutral-point-clamped (DCI-NPC) topologies to present very low distortion at high power. In these applications a lot of ...

    • New strategy to minimize dead-time distortion in DCI-NPC power amplifiers using COE-error injection 

      Resano, Tomas; Sala Caselles, Vicenç; Romeral Martínez, José Luis; Moreno Eguilaz, Juan Manuel (Curran, 2013)
      Conference report
      Restricted access - publisher's policy
      The DCI-NPC topology has become one of the best options to optimize energy efficiency in the world of high power and high quality amplifiers. This can use an analog PWM modulator that is sensitive to generate distortion ...

    • Performance of the optical amplifier in fiber digital transmission systems with timing uncertainty 

      Junyent Giralt, Gabriel; Ruiz Moreno, Sergio; Ruiz Boqué, Sílvia (1989)
      Conference report
      Open Access
      The authors analyze the signal-to-noise ratio (SNR) at the photodetector output for a single-mode fiber optic digital transmission system including online optical amplifiers and an optical preamplifier. The effect of timing ...

    • Signal to noise ratio in nonlinear optical amplification process 

      Soneira Ferrando, M. José; Ruiz Moreno, Sergio (1990-01)
      Article
      Open Access
      In this communication, one looks at the influence of the saturation process over the statistical fluctuations (signal to noise ratio) of the optical power at the output of a travelling wave semiconductor optical amplifier ...

    • Steady state analysis of class-E amplifier with non-linear capacitor by means of discrete-time techniques 

      Águila López, Francisco del; Palà Schönwälder, Pere; Bonet Dalmau, Jordi; Giralt Mas, Ma. Rosa (The Institute of Electrical and Electronics Engineers, 2000)
      Conference report
      Open Access
      A new method to determine the steady state response of switched nonlinear circuits is proposed. The method is based on a Gear discretization of the circuit equations. Additional samples of the waveform are used to describe ...

    • Thermal phase lag heterodyne infrared imaging for current tracking in radio frequency integrated circuits 

      Perpiñà Gilabet, Xavier; León, Javier; Altet Sanahujes, Josep; Vellvehi, Miquel; Reverter Cubarsí, Ferran; Barajas Ojeda, Enrique; Jordà, Xavier (2017-02-27)
      Article
      Open Access
      With thermal phase lag measurements, current paths are tracked in a Class A radio frequency (RF) power amplifier at 2 GHz. The amplifier is heterodynally driven at 440 MHz and 2 GHz, and its resulting thermal field was ...