A Broadband High-Efficiency Doherty Power Amplifier With Integrated Compensating Reactance

被引：130

作者：

Xia, Jing ^{[1
,2
]}

Yang, Mengsu ^{[1
]}

Guo, Yan ^{[1
]}

Zhu, Anding ^{[1
]}

机构：

[1] Univ Coll Dublin, Sch Elect & Elect Engn, Dublin 4, Ireland

[2] Jiangsu Univ, Sch Comp Sci & Commun Engn, Zhenjiang 212013, Peoples R China

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2016年 / 64卷 / 07期

基金：

爱尔兰科学基金会;

关键词：

Broadband; digital linearization; Doherty; high efficiency; integrated compensating reactance (CR); power amplifiers (PAs); ARCHITECTURE;

D O I：

10.1109/TMTT.2016.2574861

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 paper presents a high-efficiency gallium nitride Doherty power amplifier (DPA) using an integrated compensating reactance (CR) for broadband operation. With an additional quarter-wavelength transmission line integrated in the peaking amplifier output, a CR is generated to compensate the load impedance of the carrier amplifier in the low-power region and thus enhance the back-off efficiency over a wide frequency range without affecting the Doherty load modulation at saturation. For this purpose, a peaking output matching network (OMN) is employed to convert the output impedance of the peaking device into quasi-short circuit when it is off and achieve proper impedance matching when it is on. A two-point matching technique using the transmission (ABCD) matrix is employed to design such desired OMN. Measurement results show that the DPA has a 6-dB back-off efficiency of 50%-55% and a saturated efficiency of 57%-71% over the frequency band of 1.7-2.8 GHz (49% fractional bandwidth). When driven by a 20-MHz long term evolution modulated signal at 6.5-dB backoff power, the DPA can achieve an average efficiency of more than 50% with high linearity after linearization over the design frequency band.

引用

页码：2014 / 2024

页数：11

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