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

Yusoff, Zubaida Binti, Lees, Jonathan, Benedikt, Johannes, Tasker, Paul J. and Cripps, Stephen Charles 2011. Linearity improvement in RF power amplifier system using integrated Auxiliary Envelope Tracking system. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011. Published in: Seigel, Peter, Remley, Kate, Tzuang, C. and Ponchak, George eds. 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE, pp. 1752-1755. 10.1109/MWSYM.2011.5972769

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Abstract

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. The AET concept uses a simple and easily integrated system that consists of an RFPA, a diplexer and an envelope amplifier.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords: Gallium nitride (GaN); Intermodulation; Linearization techniques; Power amplifiers
Publisher: IEEE
ISBN: 9781612847542
Last Modified: 10 Jan 2018 05:59
URI: http://orca-mwe.cf.ac.uk/id/eprint/15580

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