Patent ID: 7256650

Claim:
A system for detecting an output power of power amplifier circuitry comprising: in-phase amplifier circuitry comprising an input amplifier stage and a final amplifier stage and adapted to amplify an in-phase input signal to provide an in-phase output signal; quadrature phase amplifier circuitry comprising an input amplifier stage and a final amplifier stage and adapted to amplify a quadrature phase input signal to provide a quadrature phase output signal; quadrature combiner circuitry adapted to provide an amplified radio frequency (RF) output signal by combining the in-phase output signal and the quadrature phase output signal; and a power detection system adapted to provide a power detection signal indicative of an output power of the power amplifier circuitry based on an in-phase detect signal indicative of a current through the final amplifier stage of the in-phase amplifier circuitry and a quadrature phase detect signal indicative of a current through the final amplifier stage of the quadrature phase amplifier circuitry.