Linearity improvement in RF power amplifier system using integrated Auxiliary Envelope Tracking system

Z. Yusoff, J. Lees, J. Benedikt, P. J. Tasker, S.C. Cripps
2011 2011 IEEE MTT-S International Microwave Symposium  
A new technique called Auxiliary Envelope Tracking (AET) is proposed, which demonstrates substantial improvement in linearity of RF power amplifiers. A small amplitude envelope-tracking voltage is superimposed on the fixed DC bias of a specially designed 25W GaN HEMT Class AB RF power amplifier (RFPA). A large improvement in third-order intermodulation (IM3) distortion has been observed while maintaining low fifth-order intermodulation (IM5). The overall drain efficiency of the RFPA is also
more » ... he RFPA is also observed to improve, even when the power consumption of the envelope tracking generator is included. The AET concept uses a simple and easily integrated system that consists of an RFPA, a diplexer and an envelope amplifier.
doi:10.1109/mwsym.2011.5972769 fatcat:6ud6sttmqnewrannvmk3nho6ci