LOW COST, PILOTLESS, FEED FORWARD COMPENSATION FOR A POWER AMPLIFIER

摘要

PURPOSE: The invention relates to a low cost feed forward RF power amplifier arrangement for amplifying an RF input signal using a main power amplifier operating as a class A/B amplifier. CONSTITUTION: The method and apparatus modify the input signal to the main amplifier to compensate for the distortion added by the main power amplifier. The circuit proides for injecting a delayed version of the input signal, through a fixed gain-phase circuitry, at a point whereby the resulting signal is amplified by the error amplifier of the second loop. 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.