Abstract
This paper presents a novel topology to control the baseband impedance of a power amplifier (PA) to avoid performance deterioration in concurrent dual-band mode. This topology can avoid pure resonance of capacitors and inductors LC, which leads to a high impedance at some frequency points. Consequently, it can be applied to transmitters that are excited by broadband signals. In particular, by adjusting the circuit parameters and increasing stages, the impedance of the key frequency bands can be flexibly controlled. A PA is designed to support this design idea. Its saturated output power is around 46.7 dBm, and the drain efficiency is >68.2% (1.8–2.3 GHz). Under concurrent two-tone excitation, the drain efficiency reaches around 40% even under 5.5 dB back-off power with the tone spacing from 10 MHz to 500 MHz. These results demonstrate that the proposed topology is capable of controlling wideband baseband impedance.
摘要
本文提出一种新的拓扑结构控制功率放大器(PA)的基带阻抗, 以避免在并发双频带模式下性能下降. 传统基带阻抗控制通过纯LC网络实现, 但局部频点发生谐振后会呈现高阻抗, 不能实现连续宽频带基带阻抗控制. 本文所提出的结构可以有效避免这一问题, 该拓扑结构可以应用于具有宽带信号激励的发射机架构. 特别地, 通过调整电路参数和增加电路的阶数, 可以灵活控制关键频带的阻抗. 为证实这一设计思想, 设计了一个功率放大器: 其饱和输出功率约为46.7 dBm, 漏极效率超过68.2%(1.8–2.3 GHz). 在同时双音激励下, 即使在5.5 dB的回退功率下, 两个频点间距从10至500 MHz, 漏极效率也达到40%左右. 这些结果表明, 所提出的拓扑结构能有效控制宽带的基带阻抗.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Yao YAO and Zhijiang DAI designed the research. Yao YAO drafted the paper. Mingyu LI helped organize the paper. Zhijiang DAI revised and finalized the paper.
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Yao YAO, Zhijiang DAI, and Mingyu LI declare that they have no conflict of interest.
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Project supported by the National Natural Science Foundation of China (No. 62001061), the Science and Technology Research Program of Chongqing Municipal Education Commission, China (No. KJQN202201525), the Natural Science Foundation of Chongqing, China (No. CSTB2022NSCQ-MSX0453), and the Research Foundation of Chongqing University of Science and Technology, China (No. CKRC2020029)
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Yao, Y., Dai, Z. & Li, M. A novel topology with controllable wideband baseband impedance for power amplifiers. Front Inform Technol Electron Eng 25, 308–315 (2024). https://doi.org/10.1631/FITEE.2300074
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DOI: https://doi.org/10.1631/FITEE.2300074