A Practical Curvature-corrected Technique for Bipolar Bandgap Reference
Bai Xiao · Development & Innovation of Machinery & Electrical Products · 2007
With the development of integrated circuits, a bandgap reference is needed to provide a much more stable reference voltage that has a fairly low temperature coefficient over the whole work temperature range. A practical piecewise-linear curvature-corrected bipolar bandgap reference is presented based on a brief discussion on the principle and merits of the conditional Brokaw bandgap reference circuit. The presented circuit can suppress the descendant trend of the temperature coefficient by introducing a factor with the positive temperature coefficient at the proper temperature. This bandgap reference is simulated using 0.8μm BCD process. The simulation results of the proposed reference have verified that the temperature coefficient of the output reference voltage is as low as 6.25 ppm/℃. The improvement on temperature coefficient is about 4 times reduction compared to the conventional approach.