High-efficiency Doherty linear amplifier with backoff control for mobile communications

Author

Iizuka, Fumitaka ; Ogino, Tsuyoshi ; Suzuki, Hiroshi ; Fukawa, Kazuhiko

Author_Institution

Taiyo Yuden Co. Ltd., Gunma, Japan

Volume

2

fYear

2005

fDate

30 May-1 June 2005

Firstpage

949

Abstract

This paper proposes a backoff control method for the Doherty amplifier that realizes both high efficiency and high linearity by using digital signal processing, which adapts to various modulation schemes in wireless communications. In order to achieve high efficiency, the control unit adjusts dc voltage of the carrier amplifier in the proposed Doherty amplifier linearized by input allocation for each branch. And the proposed amplifier has high efficiency and sufficient linearity for the signal with various peak-to-average power ratios from the different modulation schemes.

Keywords

digital signal processing chips; mobile radio; modulation; power amplifiers; telecommunication control; voltage control; dc voltage; digital signal processing; high-efficiency Doherty linear amplifier; mobile communications backoff control method; modulation schemes; wireless communications; Communication system control; Digital signal processing; High power amplifiers; Linearity; Mobile communication; OFDM modulation; Operational amplifiers; Peak to average power ratio; Power amplifiers; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st

ISSN

1550-2252

Print_ISBN

0-7803-8887-9

Type

conf

DOI

10.1109/VETECS.2005.1543446

Filename

1543446