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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2023 Vol.24 No.3 P.470-479
A novel method for extending the output power back-off range of an asymmetrical Doherty power amplifier
Abstract: 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.
Key words: Doherty power amplifier (DPA); Output power back-off (OPBO); Output impedance; Network phase
1重庆大学微电子与通信工程学院，中国重庆市，400044
2重庆邮电大学光电工程学院，中国重庆市，400065
摘要：提出一种扩展Doherty功率放大器（DPA）输出功率回退（OPBO）范围的新方法。研究表明，可以通过峰值路功放的输出阻抗来调整和改变载波功率放大器输出匹配网络的相位，来扩大DPA的输出功率回退量。基于此理论，设计了一个工作频带为1.55-2.2 GHz（35%相对带宽）、具有大输出功率回退范围的高效率非对称DPA，通过这一例子来验证所提方法的有效性。实验结果表明，DPA工作频率为1.6-2.1 GHz。OPBO状态下测量效率范围为42.2%-52.1%，饱和状态下为47%-62.7%。OPBO范围为11.1-13.2 dB。
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DOI:
10.1631/FITEE.2200250
CLC number:
TN722
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On-line Access:
2023-03-25
Received:
2022-06-07
Revision Accepted:
2023-03-25
Crosschecked:
2022-10-07