Title :
Linearity improvement in RF power amplifier system using integrated Auxiliary Envelope Tracking system
Author :
Yusoff, Z. ; Lees, J. ; Benedikt, J. ; Tasker, P.J. ; Cripps, Steve C.
Author_Institution :
Cardiff University, United Kingdom
Abstract :
Summary form only given, as follows. 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 observed to improve, even when the power consumption of the envelope tracking generator is included.
Conference_Titel :
Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-61284-754-2
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2011.5973184
