Resumo -As não linearidades de dispositivos para certas aplicações são indesejáveis. Elas ocorrem nos diversos equipamentos eletrônicos para sistemas de telecomunicações, no nosso caso, em específico, elas estão presentes na transmissão de sinais de TV Digital, totalmente dependentes de amplificadores de potência em RF. Devido ao comportamento não linear faz-se necessário realizar prévios estudos dos dispositivos e circuitos que realizem a linearização. O enfoque principal deste artigo, além da teoria, foi o desenvolvimento de uma parte experimental com a criação de um protótipo. Este, juntamente com a utilização de métodos numéricos aplicados aos recursos da pré-distorção digital, nos permite linearizar de forma eficiente os sinais de TV. Este processo se inicia com os modelos analógicos e tem hoje um grande desenvolvimento com aqueles digitais.
Nowadays, the research and development of the modem RF power amplifier have been demanded an accurate study concentrated on the linearity. Besides the distortions caused by the nonlinear devices, we have been having a constant improvement in the implementation of new modulation techniques by exploring the spectrum properties. The nonlinear performance caused by the devices is a fundamental effect, which have invoked the attention of many researchers in many famous research centers around the entire world. They have been used extremely in the actual telecommunications systems, being the main focus in the specific case of the transmission of digital signals for TV. In this paper, we present some fundamental steps already accomplished in the project of an equipment for digital transmission HDTV systems that the INATEL with the Linear Electronic Equipment Co. have been implementing in Brazil.Index terms -RF Power Amplifier, Adaptive Linearization and Digital Signals: l a n d Q.
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