Design of linearity-enhanced and high-efficiency Doherty power amplifier using a new phase compensation technique

IF 5.9 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Ain Shams Engineering Journal Pub Date : 2025-07-01 Epub Date: 2025-04-16 DOI:10.1016/j.asej.2025.103398

Jingsong Wang , Zhijiang Dai , Maomao Sun , Yating Li , Zhenyu Li , Shengdong Hu

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Abstract

This paper introduces a methodology to design linearity-enhanced and high-efficiency Doherty power amplifier (DPA). The proposed approach leverages the phase difference within the DPA's combiner at the power combining point to regulate both amplitude-to-amplitude (AM-AM) and amplitude-to-phase (AM-PM) distortion. It effectively mitigates the distortion generated by the transistor and enhances the linearity of the DPA. A DPA operating at 2.2-2.45 GHz provides output power of 45 dBm with 9 dB back-off and saturation drain efficiency over 49.2% and 72.1%. And the gain and phase distortion are controlled to 1.5 dB and 2.5^∘. Using the 10/20/40 MHz OFDM signal with a peak-to-average ratio (PAPR) of 9 dB, the average drain efficiency is approximately 45% at an average output power of 36 dBm. While the adjacent channel power ratio (ACPR) is below −36 dBc and the error vector magnitude (EVM) is below 2.6%, without any digital predistortion (DPD) technology.

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基于相位补偿技术的线性增强高效Doherty功率放大器设计

本文介绍了一种线性增强高效多尔蒂功率放大器（DPA）的设计方法。所提出的方法利用功率组合点的DPA合成器内的相位差来调节幅值对幅值（AM-AM）和幅值对相位（AM-PM）失真。它有效地减轻了晶体管产生的失真，提高了DPA的线性度。工作在2.2-2.45 GHz频段的DPA输出功率为45 dBm，后退率为9 dB，饱和漏极效率分别超过49.2%和72.1%。增益和相位失真控制在1.5 dB和2.5°。使用峰值平均比（PAPR）为9 dB的10/20/40 MHz OFDM信号，在平均输出功率为36 dBm时，平均漏极效率约为45%。而相邻通道功率比（ACPR）低于- 36 dBc，误差矢量幅度（EVM）低于2.6%，没有任何数字预失真（DPD）技术。

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来源期刊

Ain Shams Engineering Journal Engineering-General Engineering

CiteScore

10.80

自引率

13.30%

发文量

441

审稿时长

49 weeks

期刊介绍： in Shams Engineering Journal is an international journal devoted to publication of peer reviewed original high-quality research papers and review papers in both traditional topics and those of emerging science and technology. Areas of both theoretical and fundamental interest as well as those concerning industrial applications, emerging instrumental techniques and those which have some practical application to an aspect of human endeavor, such as the preservation of the environment, health, waste disposal are welcome. The overall focus is on original and rigorous scientific research results which have generic significance. Ain Shams Engineering Journal focuses upon aspects of mechanical engineering, electrical engineering, civil engineering, chemical engineering, petroleum engineering, environmental engineering, architectural and urban planning engineering. Papers in which knowledge from other disciplines is integrated with engineering are especially welcome like nanotechnology, material sciences, and computational methods as well as applied basic sciences: engineering mathematics, physics and chemistry.