A BiCMOS Bandgap Reference Based on Piecewise Temperature Curvature Compensation
Ding Dasheng, Shiliu Xu, Wang Yonglu, Tang Jie, Siying Li · 2012
A new piecewise curvature compensated voltage reference circuit was designed to solve the problem of non-linear output of bandgap reference.In this circuit,compensation was made at low and high operating temperatures,respectively,to achieve low temperature coefficient.A high gain 2-stage operational amplifier and PMOSFET with extended gate were used to improve PSRR.Simulation results showed that the circuit achieved a temperature coefficient of 2.9 ×10-6/℃ over the temperature range from-55 ℃ to 125 ℃,and a PSRR of-71 dB at low frequency.