A predistortion linearization system for high power amplifiers with low frequency envelope memory effects

Author

Woo, Wangmyong ; Kenney, J. Stevenson

Author_Institution

Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

fYear

2005

fDate

12-17 June 2005

Abstract

This paper proposes an RF envelope predistortion linearization system that utilizes a combination of an analog envelope predistortion (APD) working in conjunction with a digital look-up table (LUT) based adaptive envelope predistortion (DPD). The APD system is used as an inner loop to correct slowly varying changes in gain, effectively compensating for long time constant memory effects. The DPD forms the outer loop that corrects the distortion over a wide bandwidth. The APD/DPD combination showed up to 6 dB improvement over the DPD alone for a 90W PEP power amplifier.

Keywords

distortion; linearisation techniques; microwave power amplifiers; table lookup; 90 W; RF envelope; adaptive envelope predistortion; analog envelope predistortion; digital look-up table; high power amplifiers; low frequency envelope memory effects; predistortion linearization system; Bandwidth; Computer architecture; Digital signal processing; High power amplifiers; Nonlinear distortion; Polynomials; Predistortion; Radio frequency; Radiofrequency amplifiers; Table lookup;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2005 IEEE MTT-S International

ISSN

01490-645X

Print_ISBN

0-7803-8845-3

Type

conf

DOI

10.1109/MWSYM.2005.1516992

Filename

1516992