关键词: 张弛振荡器, CMOS工艺, 高精度, 低功耗, 温度补偿

Abstract: Aiming at the problem of low accuracy of traditional relaxation oscillator, a relaxation oscillator with low power consumption and high stability is designed. The oscillator consists of RC charge-discharge module, active filter module and bias module. A single comparator is used to realize voltage reversal to reduce the overall power consumption, the temperature change is compensated by using a mixture of resistors with opposite temperature characteristics, and the active filter generates voltage feedback to achieve high accuracy of the output clock signal. Using SMIC 0.18 μm process to construct the circuit and Spectre is used to simulate the circuit. The simulation results show that the frequency offset of the circuit is 0.43% in the wide temperature range (－40-125 ℃), the frequency change is 0.24% in the range of 1.5-2.5 V power supply voltage, and the average working current of the circuit is 19.47 μA.

Key words: relaxationoscillator, CMOSprocess, highprecision, lowpowerconsumption, temperaturecompensation