Harmonic Reaction Amplifier - A Novel High-Efficiency and High-Power Microwave Amplifier

Author

Nishiki, S. ; Nojima, T.

Volume

2

fYear

1987

fDate

May 9 1975-June 11 1987

Firstpage

963

Lastpage

966

Abstract

A newly proposed high efficiency amplifier, the Harmonic Reaction Amplifier (HRA), is presented. Power-added efficiency of 75°A (85% drain efficiency) is achieved with a 3-W HRA using GaAs FETs in the 1.7 GHz band. The operation principle is derived from a novel second-harmonic injection technique enabling purely class-B biased operation. Amplifier circuits for attaining high efficiency operation can easily be constructed with ordinary microstrip circuits. Besides, precise circuit adjustment is available to maximize the efficiency. The HRA makes high power and high efficiency microwave power amplifiers with zero quiescent current possible. Experimental test results show the feasibility of a quasi-microwave transmitting amplifier for the next generation mobile radio system. However, the HRA can be applied to radio equipment of various fields such as terrestrial microwave radio systems and satellite communications systems using microwave frequency bands.

Keywords

Circuit testing; FETs; Gallium arsenide; High power amplifiers; Microstrip; Microwave amplifiers; Microwave devices; Operational amplifiers; Radiofrequency amplifiers; System testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1987 IEEE MTT-S International

Conference_Location

Palo Alto, CA, USA

ISSN

0149-645X

Type

conf

DOI

10.1109/MWSYM.1987.1132581

Filename

1132581