A feedforward amplifier is disclosed in which either the main amplifier or the auxiliary amplifier includes at least three parallel signal paths. Each of the signal paths includes a complex gain adjuster. In addition, a feedforward amplifier is disclosed in which a plurality of control linearizers compensate...http://www.google.com.tw/patents/US6414546?utm_source=gb-gplus-share專利 US6414546 - Adaptive linearizer for RFpower amplifiers
