An Injection-Locked Ring PLL with Self-Aligned Injection Window

📋 论文概要

该论文提出了一种具有自对准注入窗口的注入锁定环形PLL，解决了传统注入锁定PLL中注入窗口与VCO相位对齐困难的问题，实现了低抖动和宽环路带宽。

💡 主要创新点

• 提出自对准注入窗口技术，自动对齐注入脉冲与VCO相位，无需额外校准。
• 采用注入锁定环形振荡器，在宽带宽下有效抑制VCO相位噪声，实现低抖动。

🏷 关键词

📄 原文摘要

In modern analog front-ends, there is an increasing demand on high- performance analog-to-digital converters (ADCs), which require high sampling frequency and low-jitter sampling clock. This makes low-jitter phase-locked loops (PLLs) with jitter on the order of few picoseconds desirable. Unfortunately, due to stringent limit on die area, sometimes a PLL with a ring oscillator is the only choice. To get better phase noise, a wider loop bandwidth is needed to suppress the noise of the voltage-controlled oscillator (VCO). However, due to the discrete-time nature of the operations, the loop bandwidth is limited to one-tenth of the crystal oscillator (XTAL) frequency. One way to solve this problem is to use the injection-locking technique. This method exploits the clean reference clock but has several production problems. One is the frequency offset between injection signal and VCO, and this can be solved by using the injection-locked PLL

👥 作者与机构

Che-Fu Liang, Keng-Jan Hsiao

MediaTek, Hsinchu, Taiwan