A CMOS Bandgap Reference Corrected by Second Degree Curve
Chen Fuji · Dianzi qijian · 2007
By using the square relation of the MOSFET saturated current to the overdrive voltage,a novel voltage difference square circuit is presented.Then,a second degree compensation term is produced to corrected the curve of the conventional CMOS bandgap reference,so that a small temperature coefficient() is achieved.Based on a standard 0.5 μm CMOS process,over the-40℃ to 120℃ temperature range,the method reduces the of a conventional reference from 21.4×10-6/℃ to 4.5×10-6/℃.The power supply can be as low as 1.8 V and the total consumed current is 12 μA.The reference can be easily set from 0 V to 1.2 V.This method can be widely used in any CMOS process and BiCMOS process.