A Low-Offset CMOS Bandgap Reference with Lateral PNP
Zongmin Wang · Microelectronics & Computer · 2007
Based on the parasitical lateral PNP,a novel CMOS bandgap voltage reference with low offset is presented.The errors caused by the input-offset voltage of the OP-AMP and the mismatch of current mirror can be minimized in the proposed architecture.Simulation shows that,the output voltage is 1.228 0V at 27℃,the total variation of output voltage is less than 2.7mV and the temperature coefficient is 13.9ppm/℃ over-40℃~125℃.Specially,the proposed bandgap has improved stability to process condition.In all process corner,the reference voltage changes less than ±25.3mV.The relative accuracy is increased by 3.3 times compared with traditional bandgap reference.At last,a complete bandgap reference is designed based on 0.35 μm CMOS process.