A new amplifier power combining scheme with optimum efficiency under variable outputs

Author

Hang, C.Y. ; Wang, Y. ; Itoh, T.

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

Volume

2

fYear

2002

fDate

2-7 June 2002

Firstpage

913

Abstract

This paper presents a new power combining scheme, which has either one or four amplifiers on depending upon the levels of input signal. This approach realized by utilizing a unique combiner that is lossless and has constant gain under both scenarios. As a result, for the system where variable output power is required, this combining scheme can be used in an amplifier design with optimum efficiency. Measurement data show 15% power efficiency for the four-amplifier scenario and 28% for the single amplifier scenario at 13dBm input power. We also investigate the possibility of using this combiner in an envelope tracking amplifier.

Keywords

UHF integrated circuits; UHF power amplifiers; circuit optimisation; microstrip circuits; power combiners; 2.2 GHz; amplifier design; amplifier power combining scheme; dual-state combiner; envelope tracking amplifier; four-amplifier scenario; input signal levels; microstrip combiner; optimum efficiency; power amplifiers; power efficiency; single amplifier scenario; variable outputs; Batteries; Energy consumption; Impedance; Linearity; Phased arrays; Power amplifiers; Power generation; Power measurement; Switches; Topology;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2002 IEEE MTT-S International

Conference_Location

Seattle, WA, USA

ISSN

0149-645X

Print_ISBN

0-7803-7239-5

Type

conf

DOI

10.1109/MWSYM.2002.1011778

Filename

1011778