Patent ID: 7917105

Claim:
A radio frequency (RF) power amplifier circuit, comprising: a power amplifier configured to receive and amplify an RF input signal to generate an RF output signal; and a power amplifier controller including: an amplitude control loop configured to determine an amplitude correction signal indicative of an amplitude difference between an amplitude of the RF input signal and an attenuated amplitude of the RF output signal and adjust a supply voltage or bias to the power amplifier based upon the amplitude correction signal; and a phase control loop configured to determine a phase error signal indicative of a phase difference between phases of the RF input signal and the RF output signal and adjust the phase of the RF input signal to reduce phase distortion generated by the power amplifier, and wherein: responsive to detecting an impedance mismatch between the power amplifier and a load coupled to an output of the power amplifier, the amplitude control loop is configured to adjust an amount of power delivered from the power amplifier to the load.