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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。
Using two double-ended differential input amplifiers (DDIA), a new high-precision curvature-compensated bandgap reference is designed. One of the DDAs generates a PTAT current, a first-order offset voltage is obtained, and the other DDIA generates a compensation voltage related to the temperature non-linearity, and a curvature compensation is performed on the temperature profile of the reference voltage to obtain a high-temperature compensated reference voltage. The circuit is based on SMIC 0.18μm standard CMOS technology. The simulation results show that the reference output voltage is 1.171 9V at 3.3V supply voltage and 1.48 × 10 ~ (-6) at -40 ℃ ~ 125 ℃. ) / ℃; low frequency, the power supply rejection ratio (PSRR) is -66dB. Supply voltage in the range of 2.5 ~ 4V, linear adjustment rate of 0.6mV / V.