In this paper, a new reconfigurable power divider (PD) is proposed to improve the efficiency of the three-way Doherty power amplifier (DPA). The conventional λ/4 transmission line is replaced by the proposed reconfigurable PD in the input of peaking amplifier, where the 90° phase shift and impedance matching can be achieved. Furthermore, the output power distribution ratio (PDR) can be continuously adjusted in a large range by adjusting the reverse voltage of the varactor diodes. Therefore, the reconfigurable PD with the best PDR can assign input power to the peaking amplifier. Experiment results show that the maximum measured power added efficiency (PAE) of the proposed three-way DPA is 49%, which is improved by 5% compared with conventional three-way DPA.

中文翻译：

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使用可重构PD的高效三路Doherty功率放大器

在本文中，提出了一种新的可重构功率分配器 (PD) 来提高三路 Doherty 功率放大器 (DPA) 的效率。在峰值放大器的输入端，传统的 λ/4 传输线被建议的可重构 PD 所取代，其中可以实现 90° 相移和阻抗匹配。此外，通过调整变容二极管的反向电压，可以在大范围内连续调整输出功率分配比（PDR）。因此，具有最佳 PDR 的可重构 PD 可以将输入功率分配给峰值放大器。实验结果表明，所提出的三路 DPA 的最大实测功率附加效率（PAE）为 49%，比传统的三路 DPA 提高了 5%。