A Doherty Power Amplifier with Large Back-Off Power Range Using Integrated Enhancing Reactance

被引：7

作者：

Kong, Wa ^{[1
]}

Xia, Jing ^{[1
,2
]}

Meng, Fan ^{[2
]}

Yu, Chao ^{[2
]}

Yang, Lixia ^{[1
]}

Zhu, Xiaowei ^{[2
]}

机构：

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

[2] Southeast Univ, State Key Lab Millimeter Waves, Nanjing 210096, Jiangsu, Peoples R China

来源：

WIRELESS COMMUNICATIONS & MOBILE COMPUTING | 2018年

基金：

美国国家科学基金会;

关键词：

HIGH-EFFICIENCY; PA;

D O I：

10.1155/2018/3968308

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

A symmetric Doherty power amplifier (DPA) based on integrated enhancing reactance (IER) was proposed for large back-off applications. The IER was generated using the peaking amplifier with the help of a desired impedance transformation in the lowpower region to enhance the back-off efficiency of the carrier amplifier. To convert the impedances properly, both in the lowpower region and at saturation, a two-impedance matching method was employed to design the output matching networks. For verification, a symmetric DPA with large back-off power range over 2.2-2.5GHz was designed and fabricated. Measurement results show that the designed DPA has the 9 dB back-off efficiency of higher than 45%, while the saturated output power is higher than 44 dBm over the whole operation bandwidth. When driven by a 20MHz LTE signal, the DPA can achieve good average efficiency of around 50% with adjacent channel leakage ratio of about -50 dBc after linearization over the frequency band of interest. The linearity improvement of the DPA for multi standard wireless communication system was also verified with a dual-band modulated signal.

引用

页数：8

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