1. School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China 2. School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
A novel method is proposed to extend the output power back-off (OPBO) range of the Doherty power amplifier (DPA). This study reveals that the OPBO range of the DPA can be extended by tuning the output impedance of the peaking stage away from infinity and changing the phase delay of the output matching network of the carrier power amplifier. Based on this theory, a large-OPBO-range high-efficiency asymmetrical DPA working band from 1.55 to 2.2 GHz (35% relative bandwidth) is designed to verify the proposed method. Experimental results show that the DPA operates from 1.6 to 2.1 GHz. The range of the measured efficiency is 42.2%–52.1% in the OPBO state and 47%–62.7% in the saturation state. The OPBO range is 11.1–13.2 dB.
李明玉, 程小兵, 代志江, 钟康, 蔡天赋, 黄超意. 一种扩展非对称Doherty功率放大器输出功率回退范围的新方法[J]. Frontiers of Information Technology & Electronic Engineering, 2023, 24(3): 470-479.
Mingyu LI, Xiaobing CHENG, Zhijiang DAI, Kang ZHONG, Tianfu CAI, Chaoyi HUANG. A novel method for extending the output power back-off range of an asymmetrical Doherty power amplifier. Front. Inform. Technol. Electron. Eng, 2023, 24(3): 470-479.
