New Current-mode Curvature-compensated CMOS Bandgap
Sun Tian-xi · Modern Electronics Technique · 2011
A new sub-1V curvature-compensated CMOS bandgap reference(BGR) circuit is presented.Different from the conventional bandgap reference,a third current is introduced to eliminate the temperature nonlinearity of VEB of parasitic p-n-p bipolar junction transistor in CMOS process.The proposed circuit was designed and simulated in a standard 0.18um CMOS process.The results show that the output reference voltage at 623 mV has a temperature coefficient of 4.2 ppm/℃ from-55 ℃ to +125 ℃,and a line regulation of 0.9 mV/V at 1～2.1 V is achieved.