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An Output Bandwidth Optimized 200-Gbs PAM-4 100-Gbs NRZ Transmitter With 5-Tap F
28nm CMOS工艺下实现200Gb/s PAM-4和100Gb/s NRZ的发射机，优化带宽和摆幅
28nm CMOS, 200Gb/s PAM-4, 100Gb/s NRZ, >52.9mV眼高, 0.36UI眼宽, >98% RLM, 4.63pJ/b
PAM-4NRZCMOS前馈均衡器高速发射机
▸最小化4:1 MUX和驱动级的输出电容
▸采用可重构5抽头前馈均衡器(FFE)
▸分段式8:4 MUX和4:1 MUX/驱动设计
Abstract
This article presents a 200-Gb/s pulse amplitude-
modulation four-level (PAM-4) and 100-Gb/s non-return-to-zero
(NRZ) transmitter (TX) in 28-nm CMOS technology. To achieve
the target data rate, the output bandwidth and swing of the pro-
posed TX are optimized by minimizing the output capacitance of
the 4:1 multiplexer (MUX) and driver stage with pull-up current
sources and adopting a fully reconfigurable 5-tap feed-forward
equalizer (FFE). The key circuit includes a segmented 8:4 MUX
and 4:1 MUX/