Patent ID: 7689180

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