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Efficiency ehancement of W‐CDMA base‐station envelope tracking power amplifiers via load modulation
Author(s) -
Jeong Jinho,
Asbeck Peter
Publication year - 2007
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.22566
Subject(s) - amplifier , electrical engineering , modulation (music) , load pull , envelope (radar) , engineering , microwave , electronic engineering , power added efficiency , power (physics) , w cdma , base station , tracking (education) , rf power amplifier , telecommunications , code division multiple access , physics , acoustics , cmos , radar , quantum mechanics , psychology , pedagogy
Load impedance modulation and gate bias control were investigated to improve the performance of W‐CDMA base‐station envelope tracking amplifiers by means of simulations based on the measured data of a 10‐W GaAs FET power amplifier. It is shown that adapting the load impedance along with the drain bias voltage can effectively improve the average efficiency of envelope tracking amplifier. The improvement becomes more apparent in the operating regime of power back‐off. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1954–1957, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22566