Patent ID: 8260225
Filing Date: 2012-09-04
Classification: H03F,H03G

Abstract:
1. A power amplifier controller circuit for controlling a power amplifier, the power amplifier coupled to receive and amplify an input signal to generate an output signal, the power amplifier controller circuit comprising: an amplitude control loop determining an amplitude correction signal indicative of an amplitude difference between an amplitude of the input signal to the power amplifier and an attenuated amplitude of the output signal of the power amplifier and adjusting a supply voltage or bias to the power amplifier based upon the amplitude correction signal to control an operating point of the power amplifier, wherein adjusting the supply voltage or bias to the power amplifier changes a gain of the power amplifier resulting in a gain error; and a variable gain amplifier adjusting the amplitude of the input signal to the power amplifier based upon a gain control signal derived from the amplitude correction signal, wherein the variable gain amplifier corrects for at least some of the gain error of the power amplifier at a higher speed than the amplitude correction loop.