A 1.9-GHz CMOS power amplifier using three-port asymmetric transmission line transformer for a polar transmitter

A 1.9-GHz CMOS differential power amplifier for a polar transmitter is implemented with a 0.18-mu m RF CMOS process. All of the matching components, including the input and output transformers, are fully integrated. The concepts of injection locking and variable load are applied to increase the efficiency and dynamic range of the amplifier. An asymmetric three-port transmission line transformer is proposed to embody the variable load effectively. The power amplifier achieved a power-added efficiency of 40% at a maximum output power of 32 dBm. The dynamic range was 20 dB at supply voltages ranging from 0.5 to 3.3 V. The improvement of the low power efficiency was 290% at an output power of 16 dBm.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2007-02
Language
ENG
Keywords

DISTRIBUTED ACTIVE-TRANSFORMER; DESIGN

Citation

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, v.55, no.2, pp.230 - 238

ISSN
0018-9480
DOI
10.1109/TMTT.2006.889152
URI
http://hdl.handle.net/10203/1575
Appears in Collection
EE-Journal Papers(저널논문)
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