Patent ID: 8095090

Claim:
A radio frequency (RF) power amplifier circuit, comprising: a power amplifier coupled to receive and amplify an RF input signal to generate an RF output signal; and a power amplifier controller including: an amplitude control loop determining an amplitude correction signal indicative of an amplitude difference between an amplitude of the RF input signal to the power amplifier and an attenuated amplitude of the RF output signal of the power amplifier and adjusting a supply voltage or bias to the power amplifier based upon a supply voltage control signal derived from the amplitude correction signal, the RF input signal being modulated and having varying amplitude, and the amplitude control loop including a variable gain amplifier adjusting the amplitude of the RF input signal based upon a gain control signal derived from the amplitude correction signal, the gain control signal being distinct from the supply voltage control signal and adjusting a gain of the variable gain amplifier, the amplitude control loop also adjusting a gain of the power amplifier based upon the amplitude correction signal; and a phase control loop determining a phase error signal indicative of a phase difference between phases of the RF input signal and the RF output signal and adjusting the phase of the RF input signal to reduce phase distortion generated by the power amplifier.