Patent ID: 7680468

Claim:
A method comprising; providing a transmit signal, the transmit signal according to a predetermined standard; providing a microwave processor, the microwave processor comprising; providing an input coupler, the input coupler for dividing the input signal into a primary input signal and a secondary input signal; providing an amplifier, the amplifier for amplifying an RF signal and providing an output signal, the output signal being a combination of an amplified replica of the RF signal and distortion generated by the amplifier; providing an output coupler, the output coupler for dividing the output signal into a primary output signal and a secondary output signal; providing a first summation circuit subtractively combining the secondary input signal and secondary output signal to provide an error signal; providing a vector demodulator, the vector demodulator operating according to a predetermined coordinate system, the vector modulator for receiving and down-converting the error signal and providing error signal components in dependence upon at least a first oscillator signal; providing for each error signal component a baseband processor, the baseband processor for processing an error signal component to provide a feedback signal component and providing a measurement signal, the measurement signal generated in dependence upon at least a measure of power of one of the error signal component and feedback signal component; providing a vector modulator, the vector modulator operating according to the predetermined coordinate system, the vector modulator for up-converting and combining the feedback signal components to form an RF feedback signal in dependence upon at least a second oscillator signal; and providing a second summation circuit for combining the primary input signal and RF feedback signal to form the RF signal; wherein, controlling the microwave processor in dependence upon the measurement signals reduces distortion in the output signal.