A method of reducing distortion in the output of an amplifier is provided. The method comprises subtractively combining baseband error signals with the appropriate phase shift with baseband input signals, the baseband error signals generated by subtractively combining delayed fed-forward portions of...http://www.google.de/patents/US7689180?utm_source=gb-gplus-sharePatent US7689180 - Method and apparatus for a cartesian error feedback circuit to correct distortion within a power amplifier
