一种新型高精度曲率补偿的带隙基准源

A New High Precision Curvature Compensated Bandgap Reference

采用2个双端差分输入放大器(DDIA),设计了一种新型高精度曲率补偿的带隙基准源。其中一个DDIA产生PTAT电流,得到1阶补偿的基准电压,另一个DDIA产生与温度非线性相关的补偿电压,对基准电压的温度曲线进行曲率补偿,得到高阶温度补偿的参考电压。该电路基于SMIC 0.18μm标准CMOS工艺,仿真结果表明:在3.3V电源电压下,基准输出电压为1.171 9V;在-40℃~125℃的温度范围内,温度系数为1.48×10^(-6)/℃;低频率时,电源抑制比(PSRR)为-66dB。电源电压在2.5~4V范围内,线性调整率为0.6mV/V。

By using two dual-differential input amplifiers （DDIA）, a new bandgap voltage reference circuit with high precision and curvature compensation was proposed. One DDIA generated a proportional to absolute temperature （PTAT） current to obtain a first order compensation reference voltage. Another DDIA generated a nonlinear compensation voltage as a function of temperature, so as to compensate the temperature curve, and the reference voltage with high order temperature compensation was obtained. Implemented in SMIC 0.18 μm CMOS process, the simulation results showed that the output reference voltage was 1. 171 9 V at 3.3 V supply, and the temperature coefficient was 1.48×10^-6/℃ at the temperature range of-40 ℃-125℃. The PSRR was -66 dB at low frequency. The linear regulation was 0.6 mV/V at supply voltage range of 2.5-4 V.