Signal pre-distortion and bandwidth requirements for Sequential Power Amplifiers

Author

Lehmann, Thomas ; Knöchel, Reinhard

Author_Institution

Microwave Res. Lab., Univ. of Kiel, Kiel, Germany

fYear

2010

fDate

23-28 May 2010

Firstpage

1056

Lastpage

1059

Abstract

This paper presents a linearization approach for Sequential Power Amplifiers (SPAs) through pre-distortion. The signal characteristics and pre-distortion waveforms for the main and peaking amplifiers are derived mathematically. The pre-distortion approach is validated experimentally by measurement of the reconstructed signals. It is found that the signal characteristics results in an at least three fold bandwidth of the signal. Rules for bandwidth restriction in the individual PA channels are given and the effect of a reduced bandwidth on the average efficiency of SPAs is shown.

Keywords

distortion; power amplifiers; signal representation; waveform analysis; PA channel; bandwidth requirement; bandwidth restriction; linearization approach; sequential power amplifier; signal bandwidth; signal characteristics; signal predistortion waveform; signal reconstruction; Bandwidth; Directional couplers; Field programmable gate arrays; Linearity; Microwave amplifiers; Nonlinear distortion; Power amplifiers; Power generation; Radiofrequency amplifiers; Statistics; Efficiency; rf power amplifiers; transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International

Conference_Location

Anaheim, CA

ISSN

0149-645X

Print_ISBN

978-1-4244-6056-4

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2010.5515564

Filename

5515564