A low power relaxation oscillator with process insensitive auto-calibration scheme

Xin Lu, Bo Wang, Zhihuang Wen, Xiaojin Zhao, Yuan Cao, A. Bermak
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引用次数: 1

Abstract

In this paper, we present an auto-calibrated process insensitive relaxation oscillator. A process sensitivity of 1.36% is achieved by automatically sensing the output clock frequency spread and alternatively adjusting the capacitor-used for charging and discharging. In addition, a time to digital converter is adopted for tuning the compensating capacitor. Moreover, the proposed oscillator with on-chip calibration scheme, implemented by UMC 0.18μm 1P6M standard process, is validated by our reported extensive post-layout simulation results. A frequency of 32.7 kHz can be generated by operating the system under 1V supply voltage.
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具有过程不敏感自动校准方案的低功率弛豫振荡器
本文提出了一种自校准过程不敏感弛豫振荡器。通过自动感知输出时钟频率扩展和交替调节用于充电和放电的电容器,实现了1.36%的过程灵敏度。此外,还采用时数字式变换器对补偿电容进行调谐。此外,采用UMC 0.18μm 1P6M标准工艺实现的片上校准方案通过大量布局后仿真结果进行了验证。在1V电源电压下操作系统可产生32.7 kHz的频率。
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