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An 85-GHz Power Amplifier Utilizing a Transformer-Based Power Combiner Operating
65nm CMOS工艺下85GHz八路四级功率放大器，采用变压器功率合成/分配器，工作频率超过自谐振频率。
29.3dB增益, 82.7-86.7GHz带宽, 19.1dBm饱和输出功率, 8.6%峰值PAE
毫米波功率放大器变压器功率合成器CMOS工艺自谐振频率阻抗匹配
▸变压器功率合成/分配器工作频率超过自谐振频率
▸多端口等效二端口网络模型分析
▸紧凑型芯片设计（核心面积0.172mm²）
Abstract
In this study, we demonstrate an 85-GHz eight-way
four-stage power amplifier (PA) with transformer-based power
combiners (PCs) and power splitters (PSs) operating beyond their
self-resonance frequencies in 65-nm CMOS. An equivalent two-
port network of a multiport PC/PS was developed to investigate
the circuit behavior for estimating the possible operating fre-
quency ranges and performing optimal impedance matching of
the PA with PCs/PSs. From the results, the PA achieved a power
gain of 29.3 dB