Feedforward amplifier for WCDMA base stations with a new adaptive control method

Author

Young Yun Woo ; Youngoo Yang ; Jaehyok Yi ; Joongjin Nam ; Jeong Hyeon Cha ; Bumman Kim

Author_Institution

Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol. (POSTECH), South Korea

Volume

2

fYear

2002

fDate

2-7 June 2002

Firstpage

769

Abstract

This paper describes a feedforward amplifier with a new adaptive control method. For the modulated signal with a high peak-to-average ratio, the residual output error level of the feedforward amplifier can be further reduced by adjusting the 1st loop control parameters to have an imperfect signal cancellation since an error amplifier generates less distortion in the case. For verification, a baseband signal simulation and experiments have been performed. A 30 W feedforward amplifier for WCDMA base stations at 2.14 GHz shows a 4 dB improvement of linearization when it is controlled by the proposed method.

Keywords

UHF power amplifiers; adaptive control; circuit simulation; circuit testing; code division multiple access; feedforward; linearisation techniques; telecommunication computing; telecommunication control; 2.14 GHz; 30 W; WCDMA base stations; adaptive control method; base station power amplifiers; baseband signal simulation; error amplifier distortion; feedforward amplifier; imperfect signal cancellation; linearization; loop control parameters; modulated signal peak-to-average ratio; residual output error level; Adaptive control; Base stations; Distortion; Error correction; Linearity; Microwave amplifiers; Multiaccess communication; Peak to average power ratio; Power amplifiers; Signal generators;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2002 IEEE MTT-S International

Conference_Location

Seattle, WA, USA

ISSN

0149-645X

Print_ISBN

0-7803-7239-5

Type

conf

DOI

10.1109/MWSYM.2002.1011743

Filename

1011743