Linearised class-B transistor amplifiers

Author

Sechi, Franco N.

Volume

11

Issue

2

fYear

1976

fDate

4/1/1976 12:00:00 AM

Firstpage

264

Lastpage

270

Abstract

The linearity and efficiency of microwave amplifiers were improved by operating the active devices in a linearised class-B mode. Good linearity, i.e., low intermodulation distortion, derives from a cancellation effect of the intermodulation products. At the same time, high efficiency is obtained because of operation in class B. Special active bias circuits were designed to extend the maximum modulation bandwidth of the amplifiers. Under low intermodulation conditions, the output power and efficiency were improved five to six times over those of amplifiers operating in class A. Moreover, the maximum modulation rate was extended to 100 MHz. These high-efficiency, high-power amplifiers are well suited for telecommunication satellite transponders.

Keywords

Bipolar transistors; Field effect transistors; Microwave amplifiers; Power amplifiers; Solid-state microwave circuits; bipolar transistors; field effect transistors; microwave amplifiers; power amplifiers; solid-state microwave circuits; Bandwidth; Circuits; Intermodulation distortion; Linearity; Microwave amplifiers; Microwave devices; Microwave transistors; Operational amplifiers; Power amplifiers; Power generation;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.1976.1050713

Filename

1050713