A 7 pA/√Hz Asymmetric Differential TIA for 100Gb/s PAM-4 links with -14dBm Optical Sensitivity in 16nm CMOS

📋 论文概要

该论文提出了一种非对称差分跨阻放大器（TIA），用于100Gb/s PAM-4光接收链路，解决了传统 shunt-feedback TIA 在噪声和带宽之间的根本性权衡问题。通过非对称设计，实现了7 pA/√Hz的输入参考噪声密度和-14dBm的光灵敏度。

💡 主要创新点

• 提出非对称差分TIA架构，打破传统SF-TIA的噪声-带宽折中限制。
• 在16nm CMOS工艺中实现7 pA/√Hz的低噪声密度，支持100Gb/s PAM-4链路。

🏷 关键词

📄 原文摘要

amplifier (TIA) is a critical building block that impacts the noise, bandwidth, and power consumption of intensity modulation and direct detection (IMDD) optical links used in data centers. CMOS TIAs using the shunt-feedback (SF) topology (Fig. 12.2.1) have recently been shown to achieve adequate noise and bandwidth performance to facilitate 100Gb/s receivers [1-4]. However, the SF-TIA suffers from debilitating tradeoffs between its noise and bandwidth, which make it fundamentally challenging to improve noise/bandwidth performance beyond what has already been achieved. An alternative that has the potential to overcome the fundamental shortcomings of the single-ended (SE) SF-TIA is a differential TIA. Recognizing that the SE-SF-TIA only

👥 作者与机构

Kadaba Lakshmikumar*1, Alexander Kurylak*1, Romesh Kumar Nandwana*1,

Bibhu Das1, Joe Pampanin1, Mike Brubaker1, Pavan Kumar Hanumolu2 CISCO Systems, Allentown, PA University of Illinois, Urbana, IL *Equally Credited Authors (ECAs) 1 2 A transimpedance