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A 1.9‐GHz CMOS power amplifier using an interdigitated transmission line transformer
Author(s) -
Park Changkun,
Baek SangHyun,
Ku BonHyun,
Hong Songcheol
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.22957
Subject(s) - electrical engineering , engineering , amplifier , transformer , cmos , electronic engineering , rf power amplifier , electric power transmission , voltage
A 1.9‐GHz CMOS differential power amplifier for polar transmitter applications is designed using a 0.25‐μm RF CMOS process. The input transformer and output transformer are fully integrated on the chip. The transmission line transformer is used as an output power combiner and an output matching component. To increase the coupling factor of the transformer, an interdigitated transmission line transformer is used and it achieves a drain efficiency of 28% at the maximum output power. The maximum output power is 28.2 dBm with a 1.8‐V supply voltage. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3162–3166, 2007; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22957