A High-Relative-Bandwidth Doherty Power Amplifier with Modified Load Modulation Network for Wireless Communications

被引：2
作者：
Zhu, Haipeng [1 ]
Zhang, Zhiwei [1 ]
Gu, Chao [2 ]
Xuan, Xuefei [1 ]
机构：
[1] Hangzhou Dianzi Univ, Sch Elect & Informat, Hangzhou 310018, Peoples R China
[2] Queens Univ Belfast, ECIT Inst, Belfast BT3 9DT, North Ireland
来源：
SENSORS | 2023年 / 23卷 / 05期
基金：
中国国家自然科学基金;
关键词：
broadband; Doherty power amplifier; load modulation network; relative bandwidth; DESIGN; COMPENSATION;
D O I：
10.3390/s23052767
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
This paper presents a novel load modulation network to realize a broadband Doherty power amplifier (DPA). The proposed load modulation network consists of two generalized transmission lines and a modified coupler. A comprehensive theoretical analysis is carried out to explain the operation principles of the proposed DPA. The analysis of the normalized frequency bandwidth characteristic shows that a theoretical relative bandwidth of approximately 86% can be obtained across a normalized frequency range of 0.4-1.0. The complete design process that allows the design of the large-relative-bandwidth DPA based on derived parameter solutions is presented. A broadband DPA operating between 1.0 GHz and 2.5 GHz was fabricated for validation. Measurements demonstrate that the DPA can deliver an output power of 43.9-44.5 dBm with a drain efficiency of 63.7-71.6% in the 1.0-2.5 GHz frequency band at the saturation level. Moreover, a drain efficiency of 45.2-53.7% can be obtained at the 6 dB power back-off level.
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页数：16
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