一种带有自动校准机制的超低功耗RC振荡器设计

Design of an ultra low power RC oscillator with auto-calibration

本文采用TSMC 0.18μmCMOS工艺设计了一种起振快速、超低功耗、带有自动校准电路的RC振荡器。本次设计的振荡器内部MOS管工作在亚阈值区域以达到降低芯片功耗的目的,最终芯片总电流消耗为0.15μA。同时,采用自动校准电路补偿了温度差异、工艺偏差、电压波动对于振荡器输出频率的影响。校准后,输出频率偏差控制在1%以内。该振荡器能够实现精准的频率输出,满足高精度、高稳定度的频率要求。

An ultra low power、fast start-up RC oscillator with auto-calibration is implemented using0.18 um CMOS process.The RC oscillator operates in the subthreshold region in order to reduce the current consumption.The total current consumption is 0.2 μA. The output frequency of thte RC oscillator is very weakly dependent on process、temperature variation and voltage fluctuation using autocalibration. After calibration, the output frequency is 32 kHz with 1% frequency offset.The RC oscilator can meets the requirements of high precision, high stability.