Highly Linear Power Tracking Doherty Amplifierfor WCDMA Repeater Applications

Author

Lee, Yong-Sub ; Lee, Mun-Woo ; Jeong, Yoon-Ha

Author_Institution

Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang

Volume

18

Issue

7

fYear

2008

fDate

7/1/2008 12:00:00 AM

Firstpage

485

Lastpage

487

Abstract

This letter presents a highly linear power tracking Doherty power amplifier (DPA) for wide-band code division multiple access (WCDMA) repeater system. To achieve maximum linearity without extra linearization circuits, the drain bias voltages of the carrier and peaking amplifiers as well as the gate bias voltage of the peaking amplifier are adaptively controlled using the power tracking method according to average power level of the input signal. For experimental verification, a two-way DPA has been implemented at the WCDMA band of 2.11~2.17 GHz and tested using one-tone, two-tone, and four-carrier WCDMA signals. Two-tone and WCDMA test results show the notable cancellation of the IM3 and IM5 components and the significant improvement in adjacent channel leakage ratio over a wide range of output power levels.

Keywords

UHF power amplifiers; code division multiple access; radio repeaters; Doherty power amplifier; IM3 components; IM5 components; WCDMA repeater; drain bias voltages; frequency 2.11 GHz to 2.17 GHz; highly linear power tracking; notable cancellation; wide-band code division multiple access repeater; Adjacent channel leakage ratio (ACLR); Doherty power amplifier (DPA); bias; linearity; power tracking; wide-band code division multiple access (WCDMA);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2008.925113

Filename

4538241