一种带有软启动的精密CMOS带隙基准设计

Design of High Precision CMOS Bandgap Voltage Reference with Soft-start up Circuit

提出了一种新颖的带有软启动的高精密CMOS带隙基准电压源。采用UMC的0.6μm2P2M标准CMOS工艺进行设计和仿真,HSPICE模拟表明该电路具有较高的精度和稳定性,带隙基准的输出电压为1.293 V,在1.5 V^4 V电源电压范围内基准随输入电压的最大偏移为0.27 mV,基准的最大静态电流约为19μA;在-40℃~120℃温度范围内,基准随温度的变化约为4.41 mV,产生的偏置电流基本上不受电源电压的影响,而与温度成线性关系;在电源电压为3 V时,基准的总电流约为14.25μA,功耗约为42.74μW;并且基准具有较高的电源抑制比和较低的噪声(小于500 nV/Hz1/2),基准的输出启动时间约为25μs。

This paper proposes a novel high precision CMOS bandgap voltage reference which with a softstart up circuit. Using 0.6 μm 2P2M standard CMOS process of UMC this bandgap voltage reference was designed and simulated, HSPICE simulation results show that this circuit has higher precision and stability, the output of the bandgap voltage is 1. 293 V, the greastest skew of reference voltage to input voltage is 0.27 mV in the power supply range from 1.5 V to 4 V, the maximum static current of reference is 19 μA;the greatest skew of reference voltage to temperature is about 4.41 mV in the range of - 40 ℃ - 120 ℃ , the reference current is hardly influenced by the power supply voltage, which is in line with temperature;the total current of the bandgap reference is about 14.25 μA with the power dissipation is about 42.74 μW at 3 V power supply, this bandgap reference also has higher PSRR and lower noise（ smaller than 500 nV/Hz^1/2） , and the start up time of output is about 25 μs.