School of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China.
ECIT Institute, Queen's University Belfast, Belfast BT3 9DT, UK.
Sensors (Basel). 2023 Mar 2;23(5):2767. doi: 10.3390/s23052767.
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.
本文提出了一种新颖的负载调制网络,以实现宽带 Doherty 功率放大器(DPA)。所提出的负载调制网络由两个广义传输线和一个改进的耦合器组成。进行了全面的理论分析,以解释所提出的 DPA 的工作原理。对归一化频率带宽特性的分析表明,在归一化频率范围为 0.4-1.0 时,可以获得约 86%的理论相对带宽。提出了一种完整的设计过程,允许基于导出参数解决方案设计大相对带宽 DPA。制造了一个工作在 1.0 GHz 至 2.5 GHz 之间的宽带 DPA 进行验证。测量结果表明,在饱和电平下,DPA 在 1.0-2.5 GHz 频带内可以提供 43.9-44.5 dBm 的输出功率,同时在 6 dB 功率回退电平下可以获得 45.2-53.7%的漏极效率。