Patent ID: 7656964

Claim:
A system for detecting both forward and reverse power at an output of power amplifier circuitry comprising: a quadrature combiner circuit adapted to: receive a first amplifier signal from an output of an in-phase amplifier leg of the power amplifier circuitry and a second amplifier signal from an output of a quadrature-phase amplifier leg of the power amplifier circuitry, wherein the second amplifier signal is phase-shifted essentially 90 degrees from the first amplifier signal; phase shift at least one of the first and second amplifier signals to provide a third amplifier signal and a fourth amplifier signal wherein the third amplifier signal is essentially in-phase with the fourth amplifier signal; and combine the third amplifier signal and the fourth amplifier signal to provide the output of the power amplifier circuitry; a forward power detection circuit adapted to: phase shift at least one of the first and second amplifier signals to provide a first forward detection signal and a second forward detection signal, wherein the first forward detection signal is essentially in-phase with the second forward detection signal; combine the first forward detection signal and the second forward detection signal to provide a combined forward detection signal; and filter the combined forward detection signal to remove effects of undesirable harmonics to provide a filtered combined forward detection signal; and a reverse power detection circuit adapted to: phase shift at least one of the first and second amplifier signals to provide a first reverse detection signal and a second reverse detection signal wherein the first reverse detection signal is essentially 180 degrees out of phase with the second reverse detection signal; combine the first reverse detection signal and the second reverse detection signal to provide a combined reverse detection signal; and filter the combined reverse detection signal to remove effects of undesirable harmonics to provide a filtered combined reverse detection signal.