@conference{10902/11465,
year = {2016},
url = {http://hdl.handle.net/10902/11465},
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%.},
organization = {This work was supported by the Ministry of Economy and Competitiveness (MINECO) through TEC2014-58341-C4-1- R, TEC2014-58341-C4-2-R and TEC2014-58341-C4-3-R projects, co-funded with FEDER. José R. Pérez-Cisneros also thanks the support to his stay at the Univ. of Cantabria provided by the pre-doctoral mobility grant EEBB-I-15-10447.},
publisher = {IEEE},
publisher = {IEEE MTT-S International Microwave Symposium (IMS),  San Francisco, 2016, 1747-1750},
title = {Constant-gain envelope tracking in a UHF outphasing transmitter based on continuous-mode class-E GaN HEMT PAs},
author = {Ruiz Lavín, María de las Nieves and Benito Temprano, Adán Luis and Pérez Cisneros, José Ramón and Gilabert Pinal, Pere Lluís and Montoro López, Gabriel and García García, José Ángel},
}