Design of Doherty power amplifier with power back-off extension based on harmonic tuning and output combining network optimization

IF 3 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Aeu-International Journal of Electronics and Communications Pub Date : 2024-09-12 DOI:10.1016/j.aeue.2024.155528

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Abstract

This paper proposes a Doherty power amplifier (DPA) design method based on harmonic tuning and output combining network (OCN) optimization to extend the power back-off (PBO) range. Firstly, based on the optimal harmonic load impedance, a harmonic tuning optimization method is used to design the harmonic tuning network of the amplifiers, effectively improving the efficiency at saturation and PBO. Secondly, the fundamental output matching network and the post-matching network are considered as an OCN. The S-parameters of the OCN are calculated and utilized in the DPA design. To further expand the PBO range, the carrier load impedance at PBO is determined by considering the relationship between PBO range and reflection coefficient. Finally, a multi-objective evolutionary algorithm combined with the theory of solution set is used to optimize the OCN design, simplifying the design process of the output matching network. For verification, a high-efficiency DPA operating at 1.68 GHz with a large PBO range of 9.5 dB is designed and measured. Results indicate that the proposed DPA achieves a saturated output power greater than 44 dBm, with a peak efficiency of up to 75.2%. The efficiencies are 68.5% and 61.0% at 6 and 9.5 dB back-off powers, respectively.

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基于谐波调谐和输出组合网络优化设计具有功率后置扩展功能的 Doherty 功率放大器

本文提出了一种基于谐波调谐和输出组合网络（OCN）优化的 Doherty 功率放大器（DPA）设计方法，以扩展功率后置（PBO）范围。首先，基于最佳谐波负载阻抗，采用谐波调谐优化方法设计放大器的谐波调谐网络，有效提高了饱和效率和 PBO。其次，将基波输出匹配网络和后匹配网络视为 OCN。我们计算了 OCN 的 S 参数，并将其用于 DPA 设计。为了进一步扩大 PBO 范围，通过考虑 PBO 范围和反射系数之间的关系，确定了 PBO 处的载波负载阻抗。最后，结合解集理论的多目标进化算法被用于优化 OCN 设计，从而简化了输出匹配网络的设计过程。为进行验证，设计并测量了工作频率为 1.68 GHz、PBO 范围达 9.5 dB 的高效 DPA。结果表明，所提出的 DPA 实现了大于 44 dBm 的饱和输出功率，峰值效率高达 75.2%。在 6 dB 和 9.5 dB 偏置功率下，效率分别为 68.5% 和 61.0%。

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来源期刊

Aeu-International Journal of Electronics and Communications 工程技术-电信学

CiteScore

6.90

自引率

18.80%

发文量

292

审稿时长

4.9 months

期刊介绍： AEÜ is an international scientific journal which publishes both original works and invited tutorials. The journal''s scope covers all aspects of theory and design of circuits, systems and devices for electronics, signal processing, and communication, including: signal and system theory, digital signal processing network theory and circuit design information theory, communication theory and techniques, modulation, source and channel coding switching theory and techniques, communication protocols optical communications microwave theory and techniques, radar, sonar antennas, wave propagation AEÜ publishes full papers and letters with very short turn around time but a high standard review process. Review cycles are typically finished within twelve weeks by application of modern electronic communication facilities.