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该论文提出了一种28GHz紧凑型3路变压器基并行-串行Doherty功率放大器，解决了5G毫米波通信中功率放大器在深度功率回退时效率严重下降的问题。通过创新的3路Doherty结构，在6dB和12dB功率回退处分别实现了20.4%和14.2%的功率附加效率。
University of Electronic Science and Technology of China, Chengdu, China 1 2 The 28GHz band for fifth-generation (5G) millimeter-wave wireless communication supporting high-order QAM, OFDM, and carrier aggregation (CA) requires excellent power and spectrum efficiency for higher data-rate throughput. High-order modulation often forces power amplifiers (PAs) to operate at deep power back-off (PBO) (i.e., 12dB or even higher), where typical PAs always suffer from efficiency degradation. Therefore, efficiency enhancement at deep PBO is critical to improving the average efficiency of transmitters. Many PAE-enhancement techniques, like Doherty [1,2], outphasing, and load-modulated balanced amplifiers (LMBAs) [3], have been exploited in mm-wave PAs to improve the efficiency at PBO. These techniques typically show PAE enhancement for less than 6dB PBO and suffer from poor PAE at deep PBO. Multiway Doherty PAs are preferred to
Zonglin Ma1,2, Kaixue Ma1, Keping Wang1, Fanyi Meng1
Tianjin University, Tianjin, China