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该论文提出了一种宽带开关变压器数字功率放大器，旨在提升深度回退效率，解决现代无线通信中高峰均比和宽功率范围导致的低效率问题。通过采用数字式技术和变压器结构，实现了在12/18dB及以上回退水平下的高效率。
Sophisticated OFDM modulation schemes with high spectrum efficiency and data throughput in modern wireless communication systems often result in a large peak-to-average power ratio (PAPR). Besides, wireless standards like LTE, WLAN, NB-IoT, etc., require wide transmission power range to accommodate various communication environments, and devices often function at low average output power. For better battery lifetime, it is critical to improve the power amplifier (PA) efficiency at deep power back-off (PBO) levels (e.g., 12/18dB or higher). Recently, several digital-style techniques have been employed to enhance PA PBO efficiency, such as dynamic power control [1], Class-G, and Doherty [2-4], as well as multilevel outphasing [5]. Class-G or Doherty techniques usually provide an efficiency peaking at 6dB PBO, and when combined together [2,3] or cascaded [6] they can further enhance the efficiency beyond 6dB PBO by introducing two efficiency
Liang Xiong, Tong Li, Yun Yin, Hao Min, Na Yan, Hongtao Xu
Fudan University, Shanghai, China