一种二阶曲率补偿的高精度带隙基准电压源

提出了一种输出电压可调的带隙基准电路.通过对双极晶体管基极-发射极电压的二阶温度补偿,大大改善了带隙基准的温度特性,并增加嵌套密勒补偿,进一步提高了系统的稳定性.基于0 6μm CMOS工艺,利用Hspice进行了仿真验证,结果表明,在-40～120℃温度范围内,0 8V基准电压的温度系数为6 1×10-6/℃,低频时电源抑制比为-82dB,正常工作时静态工作电流小于6 5μA.

High precision bandgap reference with 2nd order curvature compensation

A bandgap reference circuit with an adjustable output voltage is presented. The circuit is concise and simple to implement and its power dissipation is low. The temperature characteristic is improved significantly by employing 2nd order curvature compensation. Also the additional miller capacitors optimize the loop stability. Hspice simulation has been done by the 0.6μm CMOS process for validation. The results show that the achieved temperature coefficient of 0.8V reference is 6.1×10^-6／℃ over -40～120℃ and that the PSRR is -82dB at a low frequency. The quiescent current is less than 6.5μA.