Constant-gain envelope tracking in a UHF outphasing transmitter based on continuousmode class-E GaN HEMT PAs

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To access the full text documents, please follow this link: http://hdl.handle.net/2117/98613

Title:	Constant-gain envelope tracking in a UHF outphasing transmitter based on continuousmode class-E GaN HEMT PAs
Author:	Ruiz Lavin, Maria de las Nieves; Benito, Adán L.; Pérez Cisneros, J. R.; Gilabert Pinal, Pere Lluís; Montoro López, Gabriel; García, J. A.
Other authors:	Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. CSC - Components and Systems for Communications Research Group
Abstract:	A UHF outphasing transmitter, based on continuous-mode class-E power amplifiers (PAs) and implementing a constant-gain envelope tracking (ET) strategy, is presented in this paper. Drain terminating and biasing networks are designed to provide near optima impedance values at the fundamental and higher order harmonics to the selected GaN HEMT device. A high-efficiency wideband performance, 80% for a 630-890 MHz range, is obtained, besides being amenable for load-modulation through a compact outphasing scheme, incorporating a series Chireix combiner and an impedance transformer. Once characterized in a pure output power phase-coding regime, the observed limitation in dynamic range is overcome by operating the amplifiers in a sort of continuous class-J mode, while forcing the load impedance to follow a constant-gain trajectory. A 1c-WCDMA signal, with peak-to-average power ratio (PAPR) of 8.4 dB is shown to be reproduced, satisfying the linearity requirements, with an average efficiency of 58%.
Abstract:	Peer Reviewed
Subject(s):	-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica -Broadband communication systems -Radio--Transmitters and transmission -Broadband networks -Code division multiple access -Field effect analogue integrated circuits -Gallium compounds -HEMT integrated circuits -III-V semiconductors -Impedance convertors -Phase coding -Radio transmitters -UHF integrated circuits -UHF power amplifiers -Wide band gap semiconductors -Constant-gain envelope tracking -UHF outphasing transmitter -Continuous-mode class-E HEMT PA -Continuous-mode class-E power amplifier -ET strategy -Drain terminating -Biasing network -Higher order harmonics -High-efficiency wideband performance -Load modulation -Compact outphasing scheme -Series Chireix combiner -Impedance transformer -Phase coding regime -Constant-gain trajectory -Load impedance -WCDMA signal -Peak-to-average power ratio -PAPR -Frequency 630 MHz to 890 MHz -Telecomunicació de banda ampla, Sistemes de -Ràdio -- Transmissors i transmissió
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Document type:	Article - Published version Conference Object
Published by:	Institute of Electrical and Electronics Engineers (IEEE)
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