A quadrature digital power amplifier (PA) with hybrid Doherty and impedance boosting (HDIB) technique is presented for deep power back-off (PBO) efficiency enhancement in the complex domain. Less power-combining ways and dc power supplies are required for proposed PA comparing to previously reported works with deep PBO efficiency enhancement. A reconfigurable matching network (RMN) based on a novel reconfigurable transformer is proposed with more freedom to achieve a flexible load impedance tuning range of the sub-PAs. The characteristics of the reconfigurable transformer based on tunable inductors are analyzed. Efficiency enhancement is achieved at 3-/6-/9-/12-/15-dB PBOs without any supply switching or PA short-switches. The PA is fabricated in 40-nm CMOS technology with a core size of 0.83 mm ² . Operating at 2.3–3.4 GHz, it introduces 24.2-dBm peak $P_{\text {out}}$ with 38.5% peak drain efficiency (DE) at 2.8 GHz. It achieves 38.5%/29.6%/18.4% at 2.8 GHz and 34.7%/26.6%/17.8% DE at 3.3 GHz for 0-/6-/12-dB PBO, 39.3%/29.5%/14.9% at 2.8 GHz, and 35.3%/27.9%/15.9% DE at 3.3 GHz for 3-/9-/15-dB PBO, respectively. For 10-MHz 256-QAM modulation signal, it delivers 16.22-/15.50-dBm average $P_{\text {out}}$ with EVM of −32.3/−33.0 dB, average DE of 24.6%/22.7%, and ACLR of −33.20/−31.54 dBc at 2.8/3.3 GHz, respectively. For 20-MHz 64 QAM modulation signal, it exhibits 16.42-/15.52-dBm average $P_{\text {out}}$ with EVM of −29.1/−29.3 dB, average DE of 24.9%/22.78%, and ACLR of −30.78/−30.74 dBc at 2.8/3.3 GHz, respectively.

中文翻译：

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具有混合Doherty和阻抗提升功能的正交数字功率放大器，可增强复杂域的功率回退效率

提出了一种采用混合Doherty和阻抗增强（HDIB）技术的正交数字功率放大器（PA），以在复杂域中提高深功率补偿（PBO）的效率。与先前报道的具有显着PBO效率增强的工作相比，拟议的PA需要更少的功率组合方式和直流电源。提出了一种基于新型可重配置变压器的可重配置匹配网络（RMN），该网络具有更大的自由度，可实现子PA的灵活的负载阻抗调谐范围。分析了基于可调电感的可重配置变压器的特性。在3- / 6- / 9- / 12- / 15-dB PBO上实现了效率增强，而无需任何电源开关或PA短路开关。该PA采用40 nm CMOS技术制造，核心尺寸为0.83 mm ² 。工作于2.3–3.4 GHz，引入24.2-dBm峰值 $ P _ {\ text {out}} $ 在2.8 GHz时具有38.5％的峰值漏极效率（DE）。对于0- / 6- / 12-dB PBO，它在2.8 GHz时达到38.5％/ 29.6％/ 18.4％和3.3 GHz时DE为34.7％/ 26.6％/ 17.8％，在2.8 GHz时达到39.3％/ 29.5％/ 14.9％， 3- / 9- / 15-dB PBO在3.3 GHz时的DE和35.3％/ 27.9％/ 15.9％DE。对于10-MHz 256-QAM调制信号，它平均提供16.22- / 15.50-dBm $ P _ {\ text {out}} $ 在2.8 / 3.3 GHz下，EVM分别为−32.3 / −33.0 dB，平均DE为24.6％/ 22.7％和ACLR为−33.20 / −31.54 dBc。对于20-MHz 64 QAM调制信号，其平均表现为16.42- / 15.52-dBm $ P _ {\ text {out}} $ 在2.8 / 3.3 GHz时的EVM为−29.1 / −29.3 dB，平均DE为24.9％/ 22.78％和ACLR为−30.78 / −30.74 dBc。