Design of Broadband Linearity-Enhanced Doherty Power Amplifier Using Complex Combining Load Impedance

IF 3.4 0 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE microwave and wireless technology letters Pub Date : 2026-09-01 Epub Date: 2026-03-31 DOI:10.1109/LMWT.2026.3678047

Yusha Lin;Weimin Shi;Zhenxing Yang;Fan Gao;Mingyu Li

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Abstract

This letter presents a design method for a broadband linearity-enhanced Doherty power amplifier (DPA). A modified Doherty combiner is adopted to mitigate the amplitude-to-amplitude (AM-AM) and amplitude-to-phase (AM-PM) distortions of the DPA, while a complex combining impedance is utilized to optimize the back-off efficiency over a wide bandwidth. The theoretical relationships between AM-AM/ PM and Doherty combiner parameters are derived to implement a high-linear broadband DPA, which operates in the frequency band of 0.95–1.21 GHz (a relative bandwidth of 24.1%). In this frequency band, the fabricated DPA achieves a saturation output power of 39.7–41 dBm, a saturation drain efficiency (DE) of 66%–74.7%, and a 6-dB back-off DE of 43.5%–53.4% when under excitation of a continuous-wave (CW) signal. Furthermore, when driven by a 30-MHz 64-QAM signal with a peak-to-average power ratio (PAPR) of 6.8 dB, at an average output power of approximately 33 dBm, the measured EVMs are better than 2.45% and the adjacent channel leakage ratios (ACLRs) are better than −38.3 dBc in the operating band without any digital predistortion (DPD) techniques.

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基于复合负载阻抗的宽带线性增强多尔蒂功率放大器设计

本文介绍了一种宽带线性增强Doherty功率放大器（DPA）的设计方法。采用改进的Doherty组合器来减轻DPA的幅相失真（AM-AM）和幅相失真（AM-PM），并利用复杂的组合阻抗来优化宽带宽下的回退效率。推导了AM-AM/ PM与Doherty组合器参数之间的理论关系，实现了工作在0.95 ~ 1.21 GHz（相对带宽为24.1%）频段的高线性宽带DPA。在该频段，在连续波（CW）信号激励下，所制备的DPA的饱和输出功率为39.7 ~ 41 dBm，饱和漏极效率（DE）为66% ~ 74.7%，6 db的回退DE为43.5% ~ 53.4%。此外，当由峰均功率比（PAPR）为6.8 dB的30 mhz 64-QAM信号驱动时，在平均输出功率约为33 dBm时，在没有任何数字预失真（DPD）技术的情况下，测量到的evm优于2.45%，相邻通道泄漏比（ACLRs）优于- 38.3 dBc。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE microwave and wireless technology letters

CiteScore

6.00

自引率

0.00%

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