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Abstract: We propose an optimization method based on evolutionary computation for the design of broadband high-efficiency current-biased reverse load-modulation power amplifiers (CB-RLM PAs). First, given the reverse load-modulation characteristics of CB-RLM PAs, a comprehensive objective function is proposed that combines multi-state impedance trajectory constraints with in-band performance deviations. For the saturation and 6 dB power back-off (PBO) states, approximately optimal impedance regions on the Smith chart are derived using impedance constraint circles based on load-pull simulations. These regions are used together with in-band performance deviations (e.g., saturated efficiency, 6 dB PBO efficiency, and saturated output power) for matching network optimization and design. Second, a multi-objective evolutionary algorithm based on decomposition with adaptive weights, neighborhood, and global replacement is integrated with harmonic balance simulations to optimize design parameters and evaluate performance. Finally, to validate the proposed method, a broadband CB-RLM PA operating from 0.6 to 1.8 GHz is designed and fabricated. Measurement results show that the efficiencies at saturation, 6 dB PBO, and 8 dB PBO all exceed 43.6%, with saturated output power being maintained at 40.9–41.5 dBm, which confirms the feasibility and effectiveness of the proposed broadband high-efficiency CB-RLM PA optimization and design approach.

基于阻抗和性能约束的高效电流偏置逆向负载调制功率放大器设计与优化

[1]Akbarpour M, Helaoui M, Ghannouchi FM, 2012. A transformer-less load-modulated (TLLM) architecture for efficient wideband power amplifiers. IEEE Trans Microw Theory Tech, 60(9):2863-2874.

[2]Akbarpour M, Ghannouchi FM, Helaoui M, 2017. Current-biasing of power-amplifier transistors and its application for ultra-wideband high efficiency at power back-off. IEEE Trans Microw Theory Tech, 65(4):1257-1271.

[3]Chen CH, Yang YS, Chen CY, et al., 2020. Circuit-simulation-based design optimization of 3.5 GHz Doherty power amplifier via multi-objective evolutionary algorithm and unified optimization framework. IEEE Int Symp on Radio-Frequency Integration Technology, p.76-78.

[4]Doherty W, 1936. A new high efficiency power amplifier for modulated waves. Proc Inst Radio Eng, 24(9):1163-1182.

[5]Fan Z, Hao Z, Jin B, et al., 2025. Design of RF PAs using PSO algorithm with dynamic nonlinear self-adaptive hyperparameters. IEEE Trans Microw Theory Tech, 73(4):2157-2169.

[6]Fang X, Cheng KKM, 2014. Extension of high-efficiency range of Doherty amplifier by using complex combining load. IEEE Trans Microw Theory Tech, 62(9):2038-2047.

[7]Fang X, Chen R, Shi J, 2024. Switchless class-G power amplifiers: generic theory and design methodology using packaged transistors. IEEE Trans Microw Theory Tech, 72(8):4625-4637.

[8]Gan DC, Shi WM, He SB, et al., 2020. Broadband Doherty power amplifier with transferable continuous mode. IEEE Access, 8:99485-99494.

[9]Gao RB, Pang JZ, Cai TF, et al., 2022. Dual-band three-way Doherty power amplifier employing dual-mode gate bias and load compensation network. IEEE Trans Microw Theory Tech, 70(4):2328-2340.

[10]Giofrè R, Piacibello A, Camarchia V, et al., 2024. A two-way GaN Doherty amplifier for 5G FR2 with extended back-off range. IEEE Microw Wirel Technol Lett, 34(3):314-317.

[11]Hong YG, Huang JJ, Cai JL, 2025. Design of broadband RF PAs using an improved Bayesian optimization algorithm. IEEE Trans Microw Theory Tech, 73(10):7469-7481.

[12]Iqbal M, Peppas I, Pitton M, et al., 2025. An integrated Doherty power amplifier module based on an advanced GaN-on-Si HEMT technology and a wideband power combiner. IEEE Microw Wirel Technol Lett, 35(6):828-831.

[13]Jin BH, Crupi G, Cai JL, 2025. Design of multi-octave RF PA based on PSO method with individually self-adaptive hyperparameters. Int Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, p.1-3.

[14]Ju Y, Chen Y, Bae S, et al., 2025. Load network for broadband Doherty power amplifiers using non-foster characteristics of a coupled transmission line. IEEE Trans Microw Theory Tech, 73(11):8845-8856.

[15]Kong W, Zhong Y, Xia J, et al., 2024. Optimization design of broadband Doherty PA using fragment-type matching network based on dual-state impedance objective function. IEEE Trans Circ Syst II Expr Briefs, 71(4):1809-1813.

[16]Li C, You F, Peng J, et al., 2020. Co-design of matching sub-networks to realize broadband symmetrical Doherty with configurable back-off region. IEEE Trans Circ Syst II Expr Briefs, 67(10):1730-1734.

[17]Liu HY, Fang XH, Cheng KKM, 2020. Bandwidth enhancement of frequency dispersive Doherty power amplifier. IEEE Microw Wirel Compon Lett, 30(2):185-188.

[18]Moreno Rubio JJ, Camarchia V, Pirola M, et al., 2018. Design of an 87% fractional bandwidth Doherty power amplifier supported by a simplified bandwidth estimation method. IEEE Trans Microw Theory Tech, 66(3):1319-1327.

[19]Ni ZP, Xia J, Zhou XY, et al., 2025a. Design and analysis of optimization method for ultra-wideband PA based on improved MOEA/D algorithm using mixed objective function. IEEE Trans Comput Aided Des Integr Circ Syst, 44(7):2641-2654.

[20]Ni ZP, Xia J, Zhou XY, et al., 2025b. Design of a wideband symmetric large back-off range Doherty power amplifier based on impedance and phase hybrid optimization. Front Inform Technol Electron Eng, 26(1):146-156.

[21]Ni ZP, Xia J, Zhou XY, et al., 2025c. Optimization design of ultra-wideband PA with fragment-type structure using load impedance overlap and geometrical constraint. IEEE Trans Microw Theory Tech, 73(8):4866-4879.

[22]Pang JZ, He SB, Huang CY, et al., 2015. A post-matching Doherty power amplifier employing low-order impedance inverters for broadband applications. IEEE Trans Microw Theory Tech, 63(12):4061-4071.

[23]Sun JX, Lin F, Li B, et al., 2023. Continuous class-J/F-1 mode asymmetrical Doherty power amplifier with extended bandwidth and enhanced efficiency. IEEE Trans Microw Theory Tech, 71(11):4814-4825.

[24]Xia J, Yang M, Guo Y, et al., 2016. A broadband high-efficiency Doherty power amplifier with integrated compensating reactance. IEEE Trans Microw Theory Tech, 64(7):2014-2024.

[25]Xiao F, Dai ZJ, Pang JZ, et al., 2021. A Doherty power amplifier with extended back-off by using non-infinite peaking impedance and complex combining load. IEEE MTT-S Int Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, p.182-184.

[26]Xiao ZH, You F, Shen C, et al., 2023. A Doherty power amplifier based on AM-AM/PM cancellation combining network synthesized by back-off complex load impedance. IEEE Microw Wirel Technol Lett, 33(9):1333-1336.

[27]Yang ZX, Yao Y, Li MY, et al., 2019. Bandwidth extension of Doherty power amplifier using complex combining load with noninfinity peaking impedance. IEEE Trans Microw Theory Tech, 67(2):765-777.

[28]Zhang H, Xia J, Zhou X, et al., 2024. Optimization design of irregular broadband Doherty power amplifier based on 3-port output combining network. IEEE MTT-S Int Wireless Symp, p.1-3.

[29]Zhang H, Xia J, Ni ZP, et al., 2025. Optimization design of output combining network using irregular structure for broadband DPA. IEEE Microw Wirel Technol Lett, 35(4):480-483.

[30]Zhang Y, Pang JZ, Gao RB, et al., 2025a. Dual-wideband three-stage Doherty power amplifier using reciprocal bias configuration. IEEE Trans Microw Theory Tech, 73(9):6209-6220.

[31]Zhang Y, Gao RB, Liu S, et al., 2025b. One-dimensional reconfigurable three-stage Doherty power amplifier with load mismatch resilience. Front Inform Technol Electron Eng, 26(6):1002-1016.

[32]Zhang ZW, Fusco V, Cheng ZQ, et al., 2022. A broadband Doherty-like power amplifier with large power back-off range. IEEE Trans Circ Syst II Expr Briefs, 69(6):2722-2726.

[33]Zhao YL, Li X, Gai C, et al., 2021. Theory and design methodology for reverse-modulated dual-branch power amplifiers applied to a 4G/5G broadband GaN MMIC PA design. IEEE Trans Microw Theory Tech, 69(6):3120-3131.

[34]Zhou XY, Zheng SY, Chan WS, et al., 2017. Broadband efficiency-enhanced mutually coupled harmonic postmatching Doherty power amplifier. IEEE Trans Circ Syst I Regul Pap, 64(7):1758-1771.

[35]Zhou XY, Chan WS, Feng W, et al., 2022. Broadband Doherty power amplifier based on coupled phase compensation network. IEEE Trans Microw Theory Tech, 70(1):210-221.