Design of High-Precision Multi-Bandgap Voltage Reference Circuit for Switching Power Supply
Ning Tang, Rongjian Zhao, Shuxin Li · 2012
Based on the analysis of conventional band-gap reference circuit,a novel multi-voltage band-gap reference source for switching power supply was proposed using curvature compensation,high power gain feedback and buffer isolation technologies.The circuit achieved a high power supply rejection ratio(PSRR) and low temperature drift coefficient.Simulation based on 0.5 μm CMOS technology at process corner TT,showed that,in the temperature range from-25 ℃ to 150 ℃,the multi-voltage reference circuit had a temperature drift coefficient less than 3×10-6/℃ and a PSRR of-78 dB,and it was capable of delivering four reference voltages:-3 V,1.2 V,1 V and 0.2 V.