Highly linear power tracking Doherty amplifier for WCDMA repeater applications

被引：11
作者：
Lee, Yong-Sub [1 ]
Lee, Mun-Woo [1 ]
Jeong, Yoon-Ha [1 ]
机构：
[1] Pohang Univ Sci & Technol, Dept Elect & Elect Engn, Pohang 790784, South Korea
来源：
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2008年 / 18卷 / 07期
关键词：
adjacent channel leakage ratio (ACLR); bias; Doherty power amplifier (DPA); linearity; power tracking; wide-band code division multiple access (WCDMA);
D O I：
10.1109/LMWC.2008.925113
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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 similar to 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.
引用
收藏
页码：485 / 487
页数：3
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