一种超低功耗高精度的RC振荡器设计
Design of a RC Oscillator with Ultra-Low Power Consumption and High Precision
李静 1刘会刚 1肖知明1
作者信息
- 1. 南开大学电子信息与光学工程学院,微电子工程系,天津 300350
- 折叠
摘要
为了满足电子系统对时钟源功耗和精度的要求,设计了一种超低功耗高精度的RC振荡器电路.电路利用恒流源对电容充电的方式实现振荡,输出的时钟频率为32 kHz.首先,电路通过电流复用的方式,降低了整体的功耗;其次,通过电路内部集成数字修调结构,提高了输出频率的精度;同时,电路设计有启动和防死锁的功能,保证了电路的安全性.电路采用和舰0.11μm的工艺进行流片,典型情况下电路的整体功耗仅为160 nA;在修调后由电压和温度变化引起的频率偏差分别在±0.56％和(-1.8％)-(+0.44％)以内;且电路可以在2-5.5 V的电压范围内正常工作.
Abstract
In order to meet the requirements of power consumption and accuracy of the clock source in electronic systems,an energy efficient relaxation oscillator structure circuit with high accuracy was proposed.A constant current source is utilized to charge the capacitor to set the output clock frequency at 32 kHz.Firstly,the circuit achieves low power consumption by current multiplexing;Secondly,the accuracy of the output frequency is improved by integrating the digital trim structure;At the same time,the proposed structure includes the functions of start-up and anti-deadlock,which ensure the reliability of the circuit.The circuit was fabricated with a HJ 0.11 μm technology,the overall power consumption in typical condition is only 160 nA,the frequency deviation caused by voltage and temperature changes are within±0.56％and(-1.8％)-(+0.44％),respectively,and the circuit can operate in the voltage range of 2-5.5 V.
关键词
振荡器/超低功耗/高精度/频率修调/温度修调Key words
oscillator/ultra-low power/high precision/frequency trim/temperature trim引用本文复制引用
出版年
2024
NETL
NSTL
万方数据