Patent ID: 7773691

Claim:
A system comprising: transmit circuitry adapted to process a quadrature baseband signal comprising an in-phase component and a quadrature-phase component to provide a radio frequency transmit signal; envelope detection circuitry in communication with the transmit circuitry, the envelope detection circuitry adapted to detect an envelope amplitude of the radio frequency transmit signal and generate a feedback amplitude signal based on the detected envelope amplitude; analog-to-digital conversion circuitry adapted to convert the feedback amplitude signal to a digitized feedback amplitude signal; power control circuitry in communication with the analog-to-digital conversion circuitry, the power control circuitry adapted: to digitally calculate a reference amplitude feedback signal as a square root of the sum of the squares of the in-phase component and quadrature-phase component of the digital quadrature baseband signal; to generate a measured gain signal based upon a ratio of the digitized amplitude feedback signal to the reference amplitude feedback signal; and to adjust a gain of the transmit circuitry based on the transmit gain feedback signal such that an output power of the transmit circuitry is within a predetermined range about a target output power.