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一种低温漂低功耗RC振荡器的设计

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为了降低温度对MCU时钟频率的影响以及减小MCU的功耗,基于 0.18 μm标准CMOS工艺,设计了一种低功耗RC振荡器.该振荡器采用PTAT(Proportional To Absolute Temperature)电流和CTAT(Complementary To Absolute Temperature)电流相加给电容充电,对振荡器的频率进行温度补偿,降低温度对输出振荡频率的影响;采用低功耗亚阈值运算放大器代替传统比较器,极大降低了振荡器的功耗;设计电流修调电路,提高了振荡器输出频率的精度.该振荡器的供电电压为 1.8 V,工艺角为TT时,输出振荡频率为 231 kHz,静态工作电流为 9.6 μA;在温度变化为-25~125℃时,频率变化范围在 1%以内,温度系数为 5.9×10-5℃-1,最大工作电流仅为 12 μA;在电源电压变化 0.1 V时,频率变化范围在 1.8 kHz以内.
Design of a low temperature drift low power RC oscillator
In order to reduce the impact of temperature on MCU clock frequency and reduce MCU power consumption,a low power RC oscillator based on 0.18μm standard CMOS technology is designed.The capacitor is charged by adding PTAT(Proportional To Absolute Temperature)current and CTAT(ComplementaryTo Absolute Temperature)current,which temperature compensates the frequency of the oscillator.Reduce the effect of temperature on the output oscillation frequency.The low power subthreshold operational amplifier is used instead of the traditional comparator,which greatly reduces the power consumption of the oscillator.The current adjusting circuit is designed to improve the accuracy of the oscillator output frequency.The power supply voltage of the oscillator is 1.8 V,and when the process angle is TT,the output oscillation frequency is 231 kHz,and the static working current is 9.6 μA.When the temperature changes from-25℃to 125℃,the frequency variation range is within 1%,the temperature coefficient is 5.9×10-5℃-1,and the maximum working current is only 12 μA;When the power supply voltage changes by 0.1 V,the frequency variation range is within 1.8 kHz.

RC Oscillatorlow powertemperature compensationtemperature compensation

鲁澳宇、邹敏、喻华、邹望辉

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长沙理工大学,湖南 长沙 410114

广东华芯微特集成电路有限公司,湖南 长沙 410205

RC振荡器 低功耗 温度补偿 电流修调

2024

微电子学与计算机
中国航天科技集团公司第九研究院第七七一研究所

微电子学与计算机

CSTPCD
影响因子:0.431
ISSN:1000-7180
年,卷(期):2024.41(12)