Patent ID: 7541864

Claim:
A power amplifier for generating a power amplified output signal from an input signal, said power amplifier comprising: a phase amplification path, and a phase amplification stage within said phase amplification path, wherein the phase amplification stage receives a magnitude component of the power amplified output signal, and the phase amplification stage is responsive to a phase component of the input signal, a magnitude component of the input signal, and the received magnitude component of the power amplified output signal for generating said power amplified output signal, and wherein the phase amplification stage comprises a difference detector for generating an output depending on the difference between the received magnitude component of the input signal and the received magnitude component of the power amplified output signal, an amplitude to phase converter for converting the output of the difference detector to a phase difference signal, and a phase shifter with a first phase shifter for shifting the phase of a first phase signal, which first phase signal is a function of the phase component of the input signal, with the phase difference generated by the amplitude to phase converter, and a second phase shifter for shifting the phase of the first phase signal with the inverse of the phase difference generated by the amplitude to phase converter.