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A novel programmable predistortion circuit for broadband InGaP/GaAs HBT power amplifier
Author(s) -
Gao Huai,
Wang Rong,
Zhang Haitao,
Xue Hongxi,
Li G. P.
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.22080
Subject(s) - predistortion , monolithic microwave integrated circuit , amplifier , heterojunction bipolar transistor , dbc , adjacent channel power ratio , electrical engineering , broadband , engineering , electronic engineering , power (physics) , microwave , voltage , cmos , transistor , telecommunications , physics , bipolar junction transistor , quantum mechanics
A novel programmable MMIC predistortion circuit as an input stage of a broadband power amplifier (PA) is proposed and designed. By varying its reference voltage, one can adjust the magnitude of gain expansion and negative phase deviation to compensate the typical nonlinearities of the following stages in a PA, as well as temperature and fabrication variations. A gain expansion of 4–5 dB and a phase improvement of 5–6° are achieved in simulation. The measurement results show that P 1dB is improved by 3 dB and adjacent channel power rejection ratio (ACPR) by 5 dBc at 27 dBm output power. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 141–143, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22080