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

This paper proposes a novel high precision CMOS bandgap voltage reference which with a soft-start 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/Hz1/2),and the start up time of output is about 25 μs.