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A 56-Gbs PAM-4 TransmitterReceiver Chipset With Nonlinear FFE for VCSEL-Based Op
一款56Gb/s PAM-4光链路收发芯片组，采用非线性FFE补偿VCSEL不对称响应。
56Gb/s, -0.9dBm OMA, 1.73pJ/b(TX), 4.96pJ/b(RX), BER<10^-12@0.08UI
PAM-4VCSEL非线性均衡光通信CMOS收发机
▸基于DAC架构的两抽头非线性PAM-4前馈均衡器
▸模式滤波器的Bang-Bang相位检测器
▸针对PD+TIA模块互连损耗的CTLE+DFE联合补偿
Abstract
This article presents a 56-Gb/s four-level pulse
amplitude modulation (PAM-4) transmitter/receiver (TX/RX)
chipset for optical link. The optical transmitter (TX) adopts a
digital-to-analog converter (DAC)-based structure with a two-tap
nonlinear PAM-4 feed-forward equalizer (FFE) implemented in
the digital domain to compensate for the asymmetric responses
from the vertical cavity surface-emitting laser (VCSEL). The
56-Gb/s PAM-4 receiver (RX) is connected to the photodiode
(PD) and transimpedanc