An 8b Injection-Locked Phase Rotator with Dynamic Multiphase Injection for 28/56/112Gb/s Serdes Application

📋 论文概要

该论文提出了一种用于28/56/112Gb/s Serdes应用的8位注入锁定相位旋转器，通过动态多相注入技术解决了高速串行链路中时钟分配功耗大的问题，实现了低功耗、高精度的多相时钟生成。

💡 主要创新点

• 提出动态多相注入技术，通过调整注入相位和强度实现高精度相位旋转，避免了传统相位插值器的功耗和线性度问题。
• 采用注入锁定环形振荡器（ILRO）结构，结合8位数字控制，实现了宽频率范围（7GHz）和低抖动性能。
• 支持多种数据速率（28/56/112Gb/s）和调制格式（NRZ/PAM-4），具有可重构性，适用于不同Serdes应用场景。

🏷 关键词

📄 原文摘要

Growing traffic in data centers imposes multiple challenges on serial link design with higher speed and stringent power requirements. Clocking is one major challenge due to the significant portion of total power that clock distribution consumes in a serial link. Recent publications [1-4] deploy either a delay-locked loop (DLL), or an Injection-locked ring oscillator (ILRO) combined with phase interpolators (PIs) to generate multiphase clocks. For example, a 28Gb/s quarterrate NRZ receiver requires an 8-phase 7GHz clock while a 56/112Gb/s DSP-based PAM-4 receiver requires a 4/8-phase 7GHz clock. In this work, the proposed injection-locked phase rotator (ILPR) can provide multiphase clocks without multiple PIs or a multiphase input clock. As shown in Fig. 30.7.1, the ILPR consists of an input buffer, a phase selector, an injection NMOS switch array, a 64-phase ICO, a VCO-based ADC and a frequency-locked loop (FLL). A phase rotator (PR) code EN[31:0] controls the

👥 作者与机构

Yi-Chieh Huang, Bo-Jiun Chen

MediaTek, Hsinchu, Taiwan