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在传统带隙基准源的基础上,设计了一种改进型带隙基准源电路,能很好地抑制三极管集电极电流变化对输出的影响,获得很低的温度系数和很高的电源电压抑制比。基于BCD 0.18μm工艺库,仿真结果表明,当电源电压VIN为4.5V,温度范围为-40℃~140℃时,基准源电路的输出电压范围为1.2567~1.2581V,温度系数为6.3×10~(-6)/℃;电源电压在2.5~5V范围内变化时,基准源电路输出的最大变化仅为1.66×10~(-4)V,线性调整率为0.006 64%;低频电源电压抑制比高达97dB。过温保护电路(OTP)仿真表明,该基准源电路有良好的温度特性,温度不高于140℃都可正常工作。
Based on the traditional bandgap reference, an improved bandgap reference circuit is designed, which can effectively restrain the effect of transistor current variation on the output, obtain low temperature coefficient and high supply voltage suppression ratio. Based on the BCD 0.18μm technology library, the simulation results show that the output voltage range of the reference circuit is 1.2567 ~ 1.2581V and the temperature coefficient is 6.3 × 10 ~ 6 when the power supply voltage VIN is 4.5V and the temperature range is -40 ℃ ~ 140 ℃. (-6) / ℃. The maximum change of the output voltage of the reference circuit is only 1.66 × 10 ~ (-4) V and the linear regulation rate is 0.006 ~ 64% when the power supply voltage varies from 2.5V to 5V. Up to 97dB. Over-temperature protection circuit (OTP) simulation shows that the reference circuit has a good temperature characteristics of the circuit, the temperature is not higher than 140 ℃ can work properly.