应用于模数转换的高精度带隙基准源

High precision bandgap reference applied to analog-to-digital conversion

设计了一种应用于模数转换的高精度带隙基准电压源和电流源电路，利用温度补偿技术，该电路能分别产生零温度系数的基准电压VEEF、零温度系数的基准电流IZVAV。仿真结果显示，采用标准0．18μmCMOS工艺，在室温27℃和2．8V电源电压的条件下，电路工作频率为10Hz和1kHz时，电源抑制比（PSRR）分别为-107dB和-69dB，‰F及IZTAT的温度系数分别是20．6×10-6／℃和40．3×10-6／℃，功耗为238uw，可在2．4～3．6V电源电压范围内正常工作。

A high precision bandgap reference voltage and current source circuit which was applied to analog-to-digital conversion was designed. With the help of temperature compensation technology, the circuit respectively produced a zero temperature coefficient reference voltage VREF and current IZTAr. Simulating results show that when the circuit uses a standard 0.18 μm CMOS technology, at room temperature 27 ℃, 2.8 V power supply, working frequency are 10 Hz and 1 kHz respectively, the power supply rejection ratios of the circuit are -107 dB and -69 dB, respectively, the temperature coefficients of VREF and IZTAT are 20.6×10^-6 /℃ and 40.3×10^-6/℃, respectively, power consumption is 238 μW, power supply range is 2.4 - 3.6 V when normal working.