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针对汽车电压调节器,设计了一种受温度和电源电压变化影响很小的低频振荡器。通过采用正温度系数电流和负温度系数电流相互叠加,形成2阶补偿,以更加稳定的电流对电容进行充放电。在该振荡电路中,引入一个简单的参考电压电路,使电容充放电的电压随充放电电流的微小变化而变化,以实现电压对电流变化的补偿,从而更加有效地提高振荡器频率的稳定性。基于CSMC 40VBCD工艺,采用Spectre进行仿真,在5V电源电压、-40℃～160℃温度范围内,其频率最大误差小于0.96%;在4～6V电源电压下,温度为0℃时,其频率最大误差小于1.33%。
For the automotive voltage regulator, a low-frequency oscillator that has little effect on temperature and supply voltage is designed. Through the use of positive temperature coefficient of current and negative temperature coefficient of current superimposed on each other to form a 2-order compensation, with a more stable current charge and discharge capacitors. In this oscillating circuit, a simple reference voltage circuit is introduced to make the voltage charged and discharged by the capacitor change with the small change of the charging and discharging current so as to compensate the variation of the current with the voltage, thereby improving the stability of the oscillator frequency more effectively . Based on the CSMC 40VBCD process and Specter simulation, the maximum frequency error is less than 0.96% at 5V power supply voltage and -40 ℃ ~ 160 ℃ temperature. At 4 ~ 6V power supply voltage, The error is less than 1.33%.