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设计了一款带有误差放大器和电阻修调电路的分段曲率补偿基准电压源。通过分段电流补偿降低了温度系数;采用数字修调网络和熔丝修调网络,减小了电阻随机误差;采用误差放大器提高了电源抑制比,使基准电压精度得到显著提高。电路基于XFAB 0.35μm高压CMOS工艺设计,仿真结果显示,在-40℃~125℃的温度范围内和多种工艺角下,当输出基准电压为3.0875V时,温度系数为4.1×10-6/℃,低频电源抑制比达到-70dB。该电路的性能指标大大优于同类型产品,是一款适用于汽车电子芯片的高精度电压基准源。
A segmented curvature compensation voltage reference with an error amplifier and a resistor trimming circuit is designed. Through the segmented current compensation to reduce the temperature coefficient; the use of digital trimming network and fuse trimming network, reducing the random error of the resistance; using error amplifier to improve the power supply rejection ratio, the reference voltage accuracy has been significantly improved. The circuit is designed based on XFAB 0.35μm high voltage CMOS process. The simulation results show that when the output voltage is 3.0875V in the temperature range of -40 ℃ ~ 125 ℃ and the temperature is 4.1 × 10-6 / ℃, low frequency power supply rejection ratio reached -70dB. The performance of the circuit is much better than the same type of product, is a high-precision voltage reference for automotive electronics chips.