100Gb/s PAM-4 VCSEL Driver and TIA for Short-Reach 400G-1.6T Optical Interconnects
2021 IEEE Asia Pacific Conference on Circuit and Systems (APCCAS)(2021)
摘要
This paper presents a chipset of multi-channel vertical-cavity-surface-emitting laser (VCSEL) driver and trans-impedance amplifier (TIA) in a 180-nm SiGe BiCMOS. Targeting 400G-1.6T short-reach applications, the high-speed linear gain is developed for the four four-level pulse amplitude modulation (PAM-4). The VCSEL driver employs a second-order continuous-time linear equalizer to compensate for non-linear input channel loss, while exploiting an RC-degenerated output stage with inductive shunt peaking to extend the bandwidth. The TIA adopts the resistive feedback topology along with a series-peaking inductor to improve its input bandwidth. Experimental results show the VCSEL driver operates up to 100 Gb/s with 280-mV
pp
PAM-4 modulated swing. The TIA achieves
$61.5-\text{dB}\Omega$
trans-impedance gain, 36-GHz BW, and
$16-\text{pA}/\surd \text{Hz}$
averaged input-referred noise.
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关键词
400GBASE-SR8,four-level pulse amplitude modulation (PAM-4),vertical-cavity-surface-emitting laser (VCSEL) driver,trans-impedance amplifier (TIA)
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