Patent ID: 7109791

Claim:
A system comprising: a) power amplifier circuitry comprising an input amplifier stage adapted to receive a first supply voltage and at least one additional amplifier stage coupled in series with the input amplifier stage and adapted to receive at least one additional supply voltage, the power amplifier adapted to amplify a radio frequency (RF) input signal based on the first supply voltage and the at least one additional supply voltage to provide an amplified signal; and b) power control circuitry adapted to apply a DC offset to a control signal to create an offset control signal and provide the first supply voltage based on the offset control signal such that the first supply voltage has a predetermined DC offset with respect to the control signal and further adapted to provide the second supply voltage, wherein the predetermined DC offset of the first supply voltage reduces variations in an AM to PM distortion of the power amplifier circuitry due to variations in an RF power of the RF input signal.