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基于UMC 0.25μm BCD工艺,设计了一种4阶曲率补偿的低温漂带隙基准电压源。通过设置正负温度系数相异的电阻的比值,抵消了三极管发射极-基极电压泰勒级数展开后的高阶项,实现了4阶曲率补偿。经过Hspice仿真验证,基准输出电压为1.196V,-40℃~150℃温度范围内温度系数达到1.43×10-6/℃;低频时电源抑制比为-70.8dB,供电电压在1.7~5V变化时,基准输出电压的线性调整率为0.039%,整体静态电流仅为9.8μA。
Based on the UMC 0.25μm BCD process, a low-temperature drift bandgap reference with 4-order curvature compensation is designed. By setting the ratio of the resistances with different positive and negative temperature coefficients, the higher-order terms of the emitter-base voltage Taylor series expansion are offset and the fourth-order curvature compensation is achieved. After Hspice simulation, the reference output voltage of 1.196V, temperature coefficient of -40 ℃ ~ 150 ℃ temperature range of 1.43 × 10-6 / ℃; low-frequency power supply rejection ratio of -70.8dB, the supply voltage changes in the 1.7 ~ 5V , The reference output voltage linear adjustment rate of 0.039%, the overall quiescent current of only 9.8μA.