A 0.292pJ/b 56Gb/s/wire Capacitively Driven Simultaneous Bidirectional Transceiver with PVT/Mismatch Tracking for XSR and D2D Interfaces in 28nm CMOS

📋 论文概要

提出一种0.292pJ/b 56Gb/s/wire的单端电容驱动同时双向收发器，利用电容驱动降低功耗和自干扰，并采用AC/DC复制和PVT/失配跟踪实现PVT鲁棒性，无需额外硬件。该收发器在宽电压、温度及信道损耗范围内保持BER<1e-12，适用于极短距离（XSR）和芯片间（D2D）互连。

💡 主要创新点

• 采用电容驱动同时双向（CD-SBD）架构，在单端信号下实现低功耗和低自干扰。
• 提出AC/DC复制和PVT/失配跟踪技术，无需额外硬件即可实现工艺、电压、温度变化的鲁棒性。
• 集成每通道CDR和带正交误差校正/占空比校正（QEC/DCC）的正交发生器，确保时钟裕度。

🏷 关键词

📄 原文摘要

Abstract A low-power (0.292pJ/b), high-bandwidth (56Gb/s/wire) single-ended capacitively driven simultaneous bi-directional (CD-SBD) TRX with PVT tolerance is proposed. Capacitive driving reduces power and self-interference in SBD. AC/DC replica and PVT/mismatch tracking provides PVT robustness without extra hardware. Per-lane CDR and a quadrature generator with QEC/DCC, secure clock margin. The TRX sustains <1e-12 BER across -6.5 to -11.5dB loss, 0.93-1.2V supply, and 0-80°C temperature variation. Low power consumption and high bandwidth are two major priorities in XSR and die-todie (D2D) interfaces. Figure 8.8.1(top) shows 3 signaling candidates to achieve 2× bandwidth at the same channel density as in XSR. Capacitively driven PAM-4 (CD-PAM-4) is power-efficient and provides inherent equalization (EQ) as it uses capacitive driving [13]. However, the eye height (EH) is only 1/3 of CD-NRZ [4], leading to a degraded SNR.

👥 作者与机构

Kahyun Kim, Yoona Lee, Daehoon Na, Ha-Jung Park, Jeongeun Song, Woo-Seok Choi

Seoul National University, Seoul, Korea