A 32Gb/s Bidirectional 4-Channel 4pJ/b Capacitively Coupled Link in 14nm CMOS for Proximity Communication

📋 论文概要

本文提出了一种采用14nm CMOS工艺实现的32Gb/s双向4通道电容耦合链路，每比特能耗仅为4pJ/b，用于近程通信。该设计解决了传统电感耦合采样率低和传输线耦合带宽受限的问题，实现了高能效高速连接。

💡 主要创新点

• 采用电容耦合实现近程通信，避免了电感自谐振导致的采样率限制，同时支持双向传输。
• 4通道并行架构在14nm CMOS工艺下实现32Gb/s总数据率，每比特能耗仅4pJ/b，显著优于传统方案。

🏷 关键词

📄 原文摘要

Proximity communication offers the convenience of a connector-less high-speed interface using energy-efficient mixed-signal transceivers [1-4]. Such interfaces are attractive for ultra-thin handheld/mobile devices with zero-insertion depth connectors on the periphery, modular phones, and hermetically sealed devices. Proximity communication near millimeter-range using inductive coupling is typically limited to relatively low sampling rates of <1.25GS/s [1] due to inductor self-resonance. While interfaces using coupled transmission line (CTL) couplers are wideband (<12GS/s) [2-3], implementations have been limited to a singlechannel, which is likely due to inter-channel crosstalk. Multi-channel chip-to-chip communication using capacitive coupling has been demonstrated [4], albeit at a limited distance of 10μm. This work presents a 4-channel capacitively coupled interface (Fig. 23.2.1(a)) that supports an aggregate data-rate of 32Gb/s and up

👥 作者与机构

Chintan Thakkar, Shreyas Sen, James E. Jaussi, Bryan Casper

Intel, Hillsboro, OR