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本文针对5G FR2 CMOS功率放大器因高峰均比导致的低效率问题，提出了一种紧凑型双电容中继SPT电源调制器，采用无过冲自适应恒导通时间控制，实现了小于290ns的快速跟踪，使用0402小尺寸电感，适用于紧凑型PA阵列。
Abstract 5G new-radio frequency-range-2 CMOS PAs with high peak-to-average-power ratios suffer from low efficiency, calling for compact and fast symbol-power-tracking (SPT) supply modulators (SMs). Inductor-based SPT shows limited tracking speed, while multilevel switched-capacitor approaches need redundant capacitors and switches. The proposed prototype dual-capacitor relay SPT SM with overshoot-free adaptive constant on-time control achieves <290ns tracking using a 0402 inductor, suitable for compact PA arrays. The 5G new-radio (NR) frequency-range-2 (FR2) standard supports up to 400MHz bandwidth and uses orthogonal frequency-division multiplexing (OFDM) to achieve high data rates with complex modulation, such as quadrature amplitude modulation (QAM). CMOS PAs consume high power at average output levels due to high peak-to-averagepower ratios (PAPRs), which shortens battery life in mobile devices. Envelope tracking (ET)
Zhewen Yu1,2, Zhiguo Tong2, Junwei Huang2, Jun Yin2, Yan Lu1
Tsinghua University, Beijing, China, 2University of Macau, Macau, China