An On-Chip CMOS Relaxation Oscillator with Power Averaging Feedback Using a Reference Proportional to Supply Voltage

📋 论文概要

本文提出了一种采用功率平均反馈（PAF）的片上CMOS松弛振荡器，通过使用与电源电压成比例的参考来提高振荡精度，同时实现低功耗和小面积。解决了传统片上RC振荡器精度受工艺和温度影响的问题。

💡 主要创新点

• 提出功率平均反馈（PAF）概念，通过平均功率反馈稳定振荡频率，降低对工艺和温度变化的敏感性。
• 采用与电源电压成比例的参考，使振荡频率对电源电压变化不敏感，提高电源抑制比。

🏷 关键词

📄 原文摘要

Recently, on-chip reference oscillators are required for low-cost single-chip applications including biomedical sensors, microcomputers, high-speed interfaces such as DDR I/F and HDMI (for initial negotiation), and SoCs. RC oscillators (including relaxation oscillators) were developed to realize on-chip oscillators with standard CMOS processes. In this paper, a power-averaging feedback (PAF) concept for accurate oscillators with low power and small area is presented. Figure 23.8.1 shows the block diagram and a generic waveform of a conventional relaxation oscillator. Oscillation is performed by periodicive charging and discharging of the capacitor C as follows; 1: the voltage Vosc rises while charging C by I1, 2: If Vosc>Vhigh, the top comparator sets RS-FF and changes the state of oscillator into discharging phase, 3: Vosc falls while discharging C by I2, 4: If Vosc<Vlow, the bottom comparator resets RS-FF and the state returns

👥 作者与机构

Yusuke Tokunaga, Shiro Sakiyama, Akinori Matsumoto, Shiro Dosho

Panasonic, Osaka, Japan