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Microwave Power Amplifier Linearization Techniques

José Carlos Pedro; Jorge Perez Martinez; José Rocha Pedreira

In this work, a possible solution to the problem of integrating a microwave power amplifier and its linearizer, is presented.The most common techniques of power amplifier linearization are reviewed, and its major drawbacks identified. (...)keywords: power amplifiers; intermodulation distortion; nonlinear models; Volterra seriesPh.D., 1993more info: http://opac.ua.pt/F/?func=find-b&find_code=SYS&am...

Data: 2013 | Origem: Electrónica e Telecomunicações

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Project and Study of RF and MW Signals Synchronizers

João Nuno Pimentel da Silva Matos; José Carlos da Silva Neves; Jorge Perez Martinez

The work described in this thesis deals with the study and characterization of synchronization systems used at RF and microwave bands, mainly to achieve symbol synchronization in high bit rate digital communications. First, feedhack systems are studied with special attention given to the phase locked loop with injection (PLLI). Afterwards the problem of syrzchronization of signals with open loop structures is a...

Data: 2013 | Origem: Electrónica e Telecomunicações

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Introdução à Sincronização de Osciladores

J. Nuno Matos; Jorge Perez; J. Carlos Neves

This paper describes, in a concise form, part of the Ph. D. work [1] that concerns with modelation ofsynchronizing systems. To get a better understanding of the Phase Locked Loop with Injection (PLLI) we begin with the description and modelation of a Phase Locked Loop (PLL) and of a Injection Locked Oscillator (ILO). Following this we develop the PLLI model. In a next paper we’ll present a simulated and p...

Data: 2012 | Origem: Electrónica e Telecomunicações

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Sincronização de osciladores

J. Nuno Matos; Jorge Perez; J. Carlos Neves

This paper complete the discription of synchronizing systems, beginning in "Introdução à sincronização de osciladores" [1].It describes, in a concise form, part of the PhD work [2] that concerns with the validity of the obtained model for the Phase Locked Loop with Injection (PLLI) and compares the behaviour of a Phase Locked Loop (PLL) against the same loop with injection. ; ...

Data: 2012 | Origem: Electrónica e Telecomunicações

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Linearization of Power Amplifiers for Active Feedback

José Carlos Pedro; Jorge Perez; José Rocha Pereira

This paper describes the work developed under thePh.D. course of its author [I]. It is devided in four main partswhich refer to the motivation, theoretical background ofamplifier linearization circuits design, GaAs MESFETmodeling, and finally, experimental validation. That wasacheived by the design and test of a MMIC power amplifier,linearized by means of active feedback. ; O trabalho que neste artigo se descr...

Data: 2011 | Origem: Electrónica e Telecomunicações

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Uso de herramientas de mejoramiento y su incidencia en costos, fallas y factore...

Rave,Jorge Pérez; Rodríguez,Carmen Patiño; Manco,Olga Úsuga

En este artículo, inicialmente se describe el uso de diversas herramientas de mejoramiento y el nivel de beneficio obtenido en un grupo de empresas industriales del Valle de Aburrá (Antioquia-Colombia). Luego, se realizan análisis más profundos para explorar si el uso de dichas herramientas tiene incidencia importante en costos de no calidad (internos y externos), en costos de prevención y en fallas en: persona...

Data: 2010 | Origem: OASIS br

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