A New Numerical Approach in the Linear Analysis of RF Amplifiers

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.

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Innovative Theoretical Approaches Used for RF Power Amplifiers in Modern HDTV Systems

Silveira¹,

Silva²,

Campos³

et al. 2016

New Trends and Developments in Metrology

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The essential purpose of this chapter is to introduce theoretical and numerical approaches that can be used for modeling nonlinear effects that appear intrinsically in the design of power amplifiers that have been used widely in many modern highdensity television (HDTV) architectures. Important effects like the pre-distortion using adaptive techniques, with distinct characteristics like amplitude, phase, and frequency, as well as, their specific nature such as AM/AM, AM/PM, PM/AM, and PM/PM, and constitute one of the main directions of this research. All theoretical and technological approaches have been supported by a consistent set of numerical data performed with one of the most important platform of simulations used in the great area of Radio Frequency (RF) and Microwave structures. As a direct application, we are introducing some efficient processes that can be used for the characterization of RF systems with a set of consistent laboratorial measures that permit us to visualize the effective cost and a complete architecture for the characterization of high-power amplifiers. With the continuous and innovative technological demand that is imposed by the international marketing has a great importance to find versatile systems that are capable of measuring several amplifier characteristics, as gain, output power, inter-modulation distortion of different signals, efficiency, current, and temperature that constitute another direction of research that has been demanded strongly for news advanced technologies used widely in modern HDTV systems.

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A New Numerical Approach in the Linear Analysis of RF Amplifiers

Cited by 3 publications

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Complex filtering for generation of SSB and VSB signals

Complex filtering for generation of SSB and VSB signals

An efficient numerical approach for the power amplifier linearization

Innovative Theoretical Approaches Used for RF Power Amplifiers in Modern HDTV Systems

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