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Linearity improvement of three‐way Doherty amplifier using power tracking bias supply method
Author(s) -
Lee YongSub,
Lee MunWoo,
Jeong YoonHa
Publication year - 2008
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.23198
Subject(s) - amplifier , linearity , power (physics) , electrical engineering , electronic engineering , linear amplifier , doherty amplifier , microwave , tracking (education) , engineering , rf power amplifier , telecommunications , physics , cmos , psychology , pedagogy , quantum mechanics
This letter presents highly linear three‐way Doherty power amplifier (DPA) using power tracking bias supply method. The drain biases of carrier and peaking amplifiers and the gate biases of peaking amplifiers are adaptively controlled by the power tracking circuit according to average power levels of the input signal. For validation, a three‐way DPA is implemented using 30‐W Si LDMOSFETs and tested for two‐tone and 1‐carrier WCDMA signals at 2.14 GHz. The measured results show the notable linearity improvement over a wide output power range. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 728–731, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23198