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设计了一种带有二阶曲率补偿的低温漂高精度带隙基准电压源电路,通过采用分段线性补偿原理,分别在低温和高温阶段引入与一阶基准输出电压的温度系数呈相反趋势的线性补偿电流,通过电阻叠加到一阶基准输出电压上,从而大大提高了基准电压随温度漂移的稳定性。基于UMC 0.25μm BCD工艺库进行电路设计,HSPICE仿真结果表明,在–40~+125℃内,基准电压源的温度系数为2.2×10–6/℃,电源电压为2.5~5.0 V时基准输出电压波动仅为0.451 m V,在低频时电源抑制比PSRR为–71 d B。较好地满足了低温漂、高精度、高稳定性的带隙基准电压源设计要求。
A low-drift high-precision bandgap voltage reference circuit with second-order curvature compensation is designed. By adopting the principle of piecewise linear compensation, the temperature coefficient of the first-order reference output voltage is oppositely introduced at low temperature and high temperature The linear compensation current, superimposed on the first-order reference output voltage through the resistor, greatly increases the stability of the reference voltage with temperature drift. The circuit design based on the UMC 0.25μm BCD technology library shows that the temperature coefficient of the reference voltage is 2.2 × 10-6 / ℃ and the power supply voltage is 2.5 ~ 5.0 V at -40 ~ + 125 ℃. The reference output The voltage fluctuation is only 0.451 mV, and the power supply rejection ratio PSRR is -71 dB at low frequencies. It meets the design requirements of bandgap voltage reference with low temperature drift, high precision and high stability.