Power amplifier linearization using cubic spline interpolation

Author

Lohtia, Anit ; Goud, Paul A. ; Englefield, Colin G.

Author_Institution

TR Labs., Edmonton, Alta., Canada

fYear

1993

fDate

18-20 May 1993

Firstpage

676

Lastpage

679

Abstract

An adaptive RF power amplifier linearization technique is presented. The demodulated amplifier output is compared with the baseband input signal to estimate the amplifier´s AM-AM and AM-PM characteristics, using cubic spline interpolation. The input signal is predistorted using these estimated characteristics to compensate for the amplifier´s nonlinearity. The proposed technique has nearly 14 dB better suppression of the intermodulation products than the complex gain predistortion technique. The out-of-band power emission is about 12 dB lower in the first two adjacent RF channels than is obtained using the Cartesian coordinate negative feedback technique

Keywords

adaptive signal detection; adjacent channel interference; interference suppression; intermodulation; interpolation; linearisation techniques; power amplifiers; radiofrequency amplifiers; splines (mathematics); AM-AM characteristics; AM-PM characteristics; adaptive RF power amplifier linearization; cubic spline interpolation; intermodulation products; out-of-band power emission; predistortion; High power amplifiers; Interpolation; Linearity; Nonlinear distortion; Power amplifiers; Predistortion; RF signals; Radio frequency; Radiofrequency amplifiers; Spline;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1993., 43rd IEEE

Conference_Location

Secaucus, NJ

ISSN

1090-3038

Print_ISBN

0-7803-1267-8

Type

conf

DOI

10.1109/VETEC.1993.508782

Filename

508782