Patent ID: 7353006

Claim:
A radio frequency output power control system for use in communication systems that use a modulation scheme having a non-constant amplitude envelope, said power control system comprising: a power amplifier having a power amplifier input for receiving an input signal with a non-constant amplitude envelope, a power control input for receiving a power control signal, and a power amplifier output for providing an amplified output signal; a track and hold circuit for tracking a measured reference power signal that is representative of a modulation of the input signal; and subtraction means for subtracting an output of said track and hold circuit from said measured reference power signal that is representative of the modulation of the input signal, and subtracting a feedback signal that is representative of a modulation of the amplifier output signal a difference between from said measured reference power signal the output of said track and hold circuit to provide a power control signal that is coupled to the power control input, such that said power control signal is responsive to the feedback signal, the output of said track and hold circuit, and the measured reference power signal.