Dynamic predistortion compensation for a power amplifier

Details Dynamic predistortion compensation for a power amplifier Dynamic predistortion compensation for a power amplifier

1998-04-08

2000-04-04

Pascal, Robert

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330151, H03F 126

Patent

active

060466359

ABSTRACT:
The invention relates to an amplifier arrangement for amplifying an input using a distorting main power amplifier such as one operating as a class AB amplifier. The method and apparatus add to the input signal to the main amplifier a predistortion signal intended to compensate for the distortion added by the main power amplifier. In accordance with the invention, the predistortion signals can be dynamically modified to improve, substantially, at least the third order intermodulation components in the output of the power amplifier. A digitally controlled processor iteratively modifies various phase and gain controls to adjust the output of the amplifier. Different gain and phase control lines are iteratively updated at different rates.

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