Patent ID: 6246865
Filing Date: 2001-06-12
Classification: H01Q,H03D,H04B

Abstract:
A device for controlling a non-linear distortion characteristic of a predistorter in a radio communication transmitter wherein said predistorter is connected via an up-converter to an output amplifier and generates the non-linear distortion characteristic in opposition to non-linear distortion characteristics arising in said output amplifier, and said up-converter converting an output frequency of said predistorter into a radio frequency bandpass and outputting said converted frequency to said output amplifier, said device comprising:a monitoring unit connected to said output amplifier for monitoring an output level of said output amplifier and providing an output;a storing unit for storing the non-linear distortion characteristics of said predistorter as digital data;a distortion controller connected between said monitoring unit and said storing unit for outputting and controlling the digital data stored in said storing unit in correspondence with the output of said monitoring unit; anda digital/analog converter connected between said storing unit and said predistorter for converting the digital data outputted by said distortion controller into an analog signal and providing said analog signal to said predistorter;wherein said storing unit stores the digital data in a table including the output level of the output amplifier and at least one other quantity.