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A 56-Gbs PAM-4 VCSEL Transmitter With Piecewise Compensation Scheme in 40-nm CMO
本文提出了一种用于VCSEL的四电平脉冲幅度调制发射机，采用分段补偿方案解决非线性问题。
56-Gb/s PAM-4, 2.05 pJ/b
PAM-4VCSEL分段补偿非线性CMOS
▸分段补偿方案解决VCSEL非线性问题
▸采用单码架构和可变跨导单元
▸下降沿预加重电路改善不对称响应
Abstract
This article presents a four-level pulse amplitude
modulation (PAM-4) quarter-rate transmitter for vertical-cavity
surface-emitting lasers (VCSELs). A piecewise compensation
scheme is implemented to address VCSELs’ non-idealities,
including nonlinearities in bandwidth and electrical-to-optical
(E/O) gain versus bias current, and asymmetric responses to
rising/falling transitions. The proposed transmitter adopts a
unary code-based architecture with variable-transconductance
cells and adjustable e