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本文针对5G FR2毫米波CMOS功率放大器在高峰均功率比下效率低的问题，提出了一种400MHz符号功率跟踪（SPT）电源调制器。通过SPT自适应偏置网络，该调制器根据OFDM符号功率动态调整PA电源电压，从而提升深度功率回退效率。
The 5G new-radio (NR) frequency-range-2 (FR2) for cellular communications supports a maximum channel bandwidth of 400MHz [1] and utilizes orthogonal frequency-division multiplexing (OFDM) to support high data rates with complex modulations such as the quadrature amplitude modulation (QAM). The mm-wave CMOS power amplifiers (PAs) still consume large amounts of power at their average output power due to high peak-to-average ratios (PAPRs). Envelope tracking (ET) has been a candidate for improving the PA’s deep power-back-off (PBO) efficiency by adjusting the VDD of the PA (VDDPA) based on the output power level of the PA. The analog envelope tracking supply modulator (AET-SM) enables the ET bandwidth (BW) up to 200MHz [2] but enhancing beyond this range is challenging. Therefore, digital envelope tracking (DET) [3] and symbol power tracking (SPT) [4–6] have been suggested to surpass BW bottlenecks.
Jongbeom Baek, Ali Niknejad
University of California, Berkeley, CA