Power amplifier linearization using IF feedback

Author

Voyce, K.G. ; McCandless, J.H.

Author_Institution

Boeing Electron. Co., Seattle, WA, USA

fYear

1989

fDate

13-15 June 1989

Firstpage

863

Abstract

A narrowband feedback technique for linearizing power amplifiers is presented. The technique uses frequency conversions, thus allowing loop compensation and added loop gain to be implemented at the intermediate frequency (IF). An analysis is presented which allows assessment of the applicability of the technique and which shows the performance advantages of using a two-pole loop compensation filter. When applied to a 450-MHz power amplifier with a delay of 70 ns, the technique suppressed intermodulation products at +or-500 kHz by 12 dB with the amplifier driven to within 5 dB of its 1-dB compression point.<>

Keywords

compensation; feedback; microwave amplifiers; power amplifiers; solid-state microwave circuits; 450 MHz; 70 ns; IF feedback; added loop gain; compression point; delay; frequency conversions; intermodulation product suppression; loop compensation; narrowband feedback technique; power amplifier linearisation; two-pole loop compensation filter; Delay; Filters; High power amplifiers; Narrowband; Negative feedback; Negative feedback loops; Nonlinear distortion; Power amplifiers; Quadrature amplitude modulation; Radio frequency;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1989., IEEE MTT-S International

Conference_Location

Long Beach, CA, USA

Type

conf

DOI

10.1109/MWSYM.1989.38859

Filename

38859