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该论文提出了一种用于5G NR移动终端的包络跟踪供电调制器（ETSM），采用Class-G线性放大器和单电感双输入拓扑结构，解决了宽信号带宽（200/300MHz）、大去耦电容和高电压等级（>5V）带来的挑战，实现了83.4%的峰值效率。
Envelope tracking (ET) significantly improves the efficiency of RF power amplifiers (PAs) in mobile handsets. Most ET supply modulators (ETSMs) adopt a hybrid topology, combining a wide-bandwidth low-efficiency linear amplifier (LA) to handle high-frequency power, and a high-efficiency switching amplifier (SA) that is responsible for lowfrequency power, as shown in Fig. 31.1.1. However, as the 5G new radio (NR) standard progresses, ETSM design confronts challenges arising from wide signal bandwidth (200/300MHz), large PA decoupling capacitor (several hundreds of pF) and increased voltage rating (>5V) [1,2]. The sourcing or sinking current of the decoupling capacitor contributes a considerable portion of the output current when tracking high-frequency high-AC-swing envelope signals, and a large bias current is also required to push the LA output pole to a higher frequency. These currents multiplied by their voltage drop on the
Changjin Chen, Ximing Li, Rui Hu, Lin Cheng
University of Science and Technology of China, Hefei, China