A CMOS Bandgap Reference for PWM Control Buck DC-DC Converters
Bo Zhu · Dianzi qijian · 2013
The precision of bandgap voltage reference is vital to DC-DC converter design,so a high-precision bandgap reference source for Buck DC-DC converters is presented.Circuit is based on BJT Widler voltage reference principle.After theoretical analysis and simulation,the circuit was fabricated in BD 0.35 μm process.In the-40 ℃-160 ℃ temperature range under the conditions of the simulation,when the VIN=4.75 V,-25 ℃-160 ℃ temperature coefficient is 22×10-6/ ℃,low frequency PSRR-57.37 dB.Operating supply power from 7.5 V to 18 V,the circuit variation rate is of 0.03 mV/V,so the proposed BGR has a good performance.