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设计了一种在一定温度内具有频率稳定性的高精度互补金属氧化物半导体(CMOS)环形振荡器。该电路利用带隙基准源为后续电路提供稳定电流,实现温度补偿。采用延时迟滞技术控制延时反相器充放电电流和反相器跳变电压,改善频率随电源电压变化的缺点,提高频率稳定性。基于0.5μm标准CMOS工艺,用Spectre软件进行仿真。结果表明,在电源电压为5 V,室温27℃时,该振荡器输出频率为16 MHz。温度为-35~125℃时,频率的最大偏移为±2.95%。当电源电压为4~5.5 V时,频率的最大偏移为2.04%~0.02%,满足DC/DC电路的设计要求。
A high precision complementary metal-oxide-semiconductor (CMOS) ring oscillator with frequency stability at a certain temperature is designed. The circuit uses the bandgap reference to provide a stable current for subsequent circuits for temperature compensation. Adopt the delay hysteresis technology to control the charge and discharge current of the delay inverter and the inverter trip voltage, improve the shortcoming of the frequency change with the supply voltage and improve the frequency stability. Based on a 0.5μm standard CMOS process, simulation was performed using Specter software. The results show that the oscillator output frequency is 16 MHz at a supply voltage of 5 V and a room temperature of 27 ° C. The maximum frequency shift is ± 2.95% at temperatures from -35 to 125 ° C. When the power supply voltage is 4 ~ 5.5 V, the maximum frequency offset is 2.04% ~ 0.02%, which meets the design requirements of DC / DC circuit.