Patent ID: 6240144
Filing Date: 2001-05-29
Classification: H03D,H03F

Abstract:
An apparatus for linearizing a power amplifier in a mobile radio communication system comprising:an error detector for detecting an error between input and output signals of the power amplifier by comparing the input signal with the output signal fed back and outputting a corresponding error signal;a predistortion lookup table for storing predistortion data;a predistortion lookup table controller for updating the data of the predistortion lookup table which corresponds to a position of a present input data by adding the error signal from the error detector to an output of the predistortion lookup table;a feedforward lookup table for storing feedforward control data;a feedforward lookup table controller for outputting corresponding feedforward control data of the feedforward lookup table by detecting a size of the error signal;a linearizer for distorting the input signal in accordance with the predistortion data and then controlling a gain of the input signal in accordance with the feedforward control data; andthe power amplifier for power-amplifying an output of the linearizer and outputting a power amplified output.