Uma Eficiente Abordagem Numérica para a Linearização de Amplificadores de Potência (An Efficient Numerical Approach for the Power Amplifier Linearization)

Marcos Paulo de Souza Silva (marcos.silva@inatel.br)1, Maurício Silveira (msilveira@inatel.br)1, Adriano de Andrade Mello (adrianoam@inatel.br)2, Henry Douglas Rodrigues (henry@inatel.br)2, José de Souza Lima (desenvolvimento@linear.com.br)2


1National Institute of Telecommunication - INATEL, Brazil
2Linear Electronic Equipment S.A. - Brazil

This paper appears in: Revista IEEE América Latina

Publication Date: June 2004
Volume: 2,   Issue: 2 
ISSN: 1548-0992


Abstract:
The non-linearization of certain devices for applications are undesirable and they occur in many electronic equipments for Telecommunications Systems. In our specific case they are present in the transmission of Digital TV signals strongly dependent of the RF power amplifiers. Due to the nonlinear behavior one becomes necessary to accomplish previous studies of the devices and circuits that carry through the linearization. The main focus of this paper besides the theory was the development of an experimental practical part, with the creation of a electronic prototype. This, together with the use of some numerical methods applied to the resources of the digital pre-distortion, permit us to set an efficient linearization of the TV signals. This process starts on the analog models and have nowadays a great development with the digital one.

Index Terms:
adaptive control, digital predistortion, RF amplifiers   


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