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基于0.6μm BICMOS(双极型互补金属氧化物半导体)工艺设计了一种具有分段曲率补偿的高精度带隙基准电压源.对该分段曲率补偿电路产生不同温度区间的正温度系数电流进行补偿,且所需的补偿支路可根据实际电路要求进行设定.基准核心电路采用无运算放大器结构,形成负反馈环路稳定输出电压.同时设计了预校准电路,提高了电源抑制比.利用cadence工具仿真结果表明,在-40～125℃范围内基准电压的温度系数仅为0.3×10-6/℃,电源抑制比达到-104dB.
A high precision bandgap voltage reference with segment curvature compensation is designed based on the 0.6μm BICMOS (bipolar complementary metal-oxide semiconductor) process. The positive temperature coefficient current with different temperature ranges is generated by the segment curvature compensation circuit Compensation, and the required compensation branch can be set according to the actual circuit requirements.Reference core circuit using op-amp structure to form a negative feedback loop stable output voltage.Also designed pre-calibration circuit to improve the power supply rejection ratio. The cadence tool simulation results show that the temperature coefficient of the reference voltage is only 0.3 × 10 -6 / ° C in the range of -40 to 125 ° C and the power supply rejection ratio is -104 dB.