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本文提出了一种采用三轴巴伦合成器的28GHz outphasing功率放大器，在提供23dBm输出功率的同时实现了高效率。该设计针对毫米波通信中高峰均比波形的要求，解决了线性度与效率之间的矛盾。
University of California, Santa Barbara, Santa Barbara, CA 1 2 Gigabit-per-second millimeter-wave (mm-wave) access and backhaul networks at 28GHz demand high-order QAM, OFDM, and/or carrier-aggregated waveforms that force the PA to operate under high peak-to-average power ratio (PAPR) [1]. High PAPR requirements aggravate the design of mm-wave Si CMOS and SiGe BiCMOS PAs since a linear response and high efficiency are simultaneously desired. Recent work has demonstrated mm-wave PAs with peak efficiency exceeding 30% at 28GHz for output powers above 20dBm [1-5]. However, high average efficiency associated with high-PAPR waveforms remains elusive. To improve average efficiency, circuit techniques based on Doherty [3] and outphasing [6] have been demonstrated in mm-wave bands. Earlier work using these techniques showed average efficiency with QAM waveforms that is well under 20%. In this paper, we present a SiGe BiCMOS outphasing power amplifier (OPA) with
Bagher Rabet1, James Buckwalter2
University of California, San Diego, La Jolla, CA