Patent ID: 6915118
Filing Date: 2005-07-05
Classification: H03F

Abstract:
1. Linear compensated amplifying equipment comprising: a non-linear distortion compensator that determines a non-linear distortion compensation coefficient from a look-up table using instantaneous power of a transmission signal as an address and performs non-linear distortion compensation using a complex product of said determined coefficient and said transmission signal; a first quadrature modulator that quadrature-modulates output of said non-linear distortion compensator; a second quadrature modulator that quadrature-modulates said transmission signal; a main power amplifier that amplifies output of said first quadrature modulator; a non-linear distortion extractor that extracts a non-linear distortion signal by controlling a phase and amplitude of one of (a) output of said main power amplifier and (b) output of said second quadrature modulator and by synthesizing said two signals so that said two signals are in opposite phase; an auxiliary power amplifier that amplifies the extracted non-linear distortion signal; and a modulation signal synthesizer that controls a phase of one of (c) output of said main power amplifier and (d) output of said auxiliary amplifier, and synthesizes said two signals so that said two signals are in opposite phase.