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

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URI: http://hdl.handle.net/10902/11465
ISBN: 978-1-5090-0699-1
ISBN: 978-1-5090-0698-4
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Autoría
Ruiz Lavín, María de las NievesAutoridad Unican; Benito Temprano, Adán Luis; Pérez Cisneros, José Ramón; Gilabert Pinal, Pere Lluís; Montoro López, Gabriel; García García, José ÁngelAutoridad Unican
Fecha
2016
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© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Publicado en
IEEE MTT-S International Microwave Symposium (IMS), San Francisco, 2016, 1747-1750
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IEEE
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Palabras clave
Chireix
Class-E
Efficiency
GaN HEMT
Outphasing
Power amplifiers
UHF
Resumen/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 phasecoding 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-toaverage power ratio (PAPR) of 8.4 dB is shown to be reproduced, satisfying the linearity requirements, with an average efficiency of 58%.
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