Design of a high-efficiency and high-power inverted Doherty amplifier

被引：45
作者：
Ahn, Gunhyun [1 ]
Kim, Min-su
Park, Hyun-Chul
Jung, Sung-chan
Van, Ju-ho
Cho, Hanjin
Kwon, Sung-wook
Jeong, Jong-hyuk
Lim, Kyung-hoon
Kim, Jay Young
Song, Sung Chan
Park, Cheon-seok
Yang, Youngoo
机构：
[1] Sungkyunkwan Univ, Sch Informat & Commun Engn, Suwon 440746, South Korea
[2] Samsung Thales Co Ltd, Yongin 449712, South Korea
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2007年 / 55卷 / 06期
关键词：
Doherty power amplifier; inverted Doherty power amplifier (IDPA); load modulation; offset line; pi/4 differential quadrature phase-shift keying (DQPSK);
D O I：
10.1109/TMTT.2007.896807
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：
In this paper, we present a design method for a compact inverted Doherty power amplifier (IDPA), which has high-efficiency and high-power characteristics. An optimum load matching network and an additional offset line, after the matching network of the carrier amplifier, dynamically modulate the load impedance according to the input power drive, while the conventional Doherty power amplifier uses a quarter-wave line to do it. The operational principles and design guide are provided. For experimental verification, a 50-W Doherty amplifier was designed for the pi/4 differential quadrature phase-shift keying application at the 860-MHz band. The measured performance of the IDPA was compared with that of the balanced class-AB amplifier with the same output matching network. At an output power of 50 W, the IDPA performs with 3.16 dB better adjacent channel power ratio (-28 versus -24.84 dBc) and 6.15% higher power-added efficiency (59.02 versus 52.87 %) than the class-AB amplifier does.
引用
收藏
页码：1105 / 1111
页数：7
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