Transmitter Linearization by Beamforming
Transmitter Linearization by Beamforming
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DOI：
10.1109/jssc.2011.2148530
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发表时间：
2011-06
影响因子：
5.4
通讯作者：
ChuanKang Liang;B. Razavi
中科院分区：
文献类型：
--
作者：
ChuanKang Liang;B. Razavi
专为密集信号星座设计的毫米波发射机必须处理严格的线性度与效率权衡。本文提出了一种混合波束形成和线性化的方法，减少了功率放大器的数量并避免了片上变压器的损耗。两个恒定包络光束在空间中组合以传送可变包络信号，从而放宽发射机的线性度。采用 65 nm CMOS 技术制造并专为 60 GHz 频段设计的双发射器原型可产生 +9.7 dBm 的 16QAM 输出，效率为 11%。
Millimeter-wave transmitters designed for dense signal constellations must deal with severe linearity-efficiency trade-offs. This paper proposes a method of blending beamforming and linearization that reduces the number of power amplifiers and avoids the loss of on-chip transformers. Two constant-envelope beams are combined in space to deliver a variable-envelope signal, relaxing the linearity of transmitters. A dual-transmitter prototype fabricated in 65-nm CMOS technology and designed for the 60-GHz band produces a 16QAM output of +9.7 dBm with 11% efficiency.