A Reference-less CDR Using SAR-Based Frequency-Acquisition Technique Achieving 55ns Constant Band-Searching Time and up to 63.64Gb/s/µs Acquisition Speed

📋 论文概要

本文提出了一种无参考时钟的时钟数据恢复电路，采用逐次逼近寄存器（SAR）频率获取技术，实现了55ns的恒定频带搜索时间。该技术针对需要动态数据流量管理和快速唤醒的应用场景，解决了传统参考less CDR频率获取速度慢的问题。

💡 主要创新点

• 提出基于SAR的频率获取技术，无需外部参考时钟，简化了系统复杂度。
• 实现了55ns的恒定频带搜索时间，显著提升了CDR在动态数据流量管理中的链路建立速度。
• 与现有技术相比，该方法在保持低成本的同时，实现了快速唤醒和低延迟特性。

🏷 关键词

📄 原文摘要

in applications that demand a continuous data rate due to their simplicity and cost-effectiveness, as they eliminate the need for an external reference [1-6]. The frequency acquisition (FA) speed of such CDRs is critical for link setup, particularly in systems with dynamic data traffic management that necessitate frequent transitions from sleep to wake up [7, 8]. According to [9], part of the links can be turned off without congesting the network, even in high-load scenarios like data centers. However, the interface wake-up delay has been identified as the most significant bottleneck in the overall network. To address this issue, this paper proposes a fast FA reference-less CDR using a successive approximation register (SAR)-based frequency band switching technique, achieving a

👥 作者与机构

Xiaoteng Zhao, Yuhao Zhang, Hao Chang, Yilong Dong, Chenxi Han, Zekai Yang,

Zhicheng Dong, Rong Zhou, Shubin Liu, Zhangming Zhu Xidian University, Xi’an, China Reference-less clock and data recovery (CDR) circuits are prevalently employed