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A highly linear and efficient three‐way Doherty amplifier using two‐stage GaN HEMT cells for repeater systems
Author(s) -
Lee YongSub,
Lee MunWoo,
Kam SanHo,
Jeong YoonHa
Publication year - 2009
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.24748
Subject(s) - amplifier , high electron mobility transistor , predistortion , doherty amplifier , repeater (horology) , linearity , linear amplifier , microwave , electronic engineering , electrical engineering , engineering , rf power amplifier , computer science , transistor , telecommunications , voltage , cmos , mechanical engineering , coupling (piping)
In this article, we propose a highly linear and efficient three‐way Doherty amplifier using two‐stage GaN HEMT cells for repeater systems. The driving cells are used as the predistortion circuit to improve linearity as well as the gain stage. The main cells are optimized to achieve high efficiency at a large back‐off power. After gate bias optimization of the driving cells, the proposed three‐way Doherty amplifier with two‐stage cells shows highly linear and efficient performance. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2895–2898, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24748