A High Precision CMOS Bandgap Reference Voltage
XU Binfu · Modern Electronics Technique · 2007
A bandgap reference circuit with 2nd order temperature compensation is presented in the paper.In order to improve the power supply rejection ratio,a partial voltage which is relatively irrelevant to total voltage is used in the bandgap core,and in order to reduce the influence which caused by the offset voltage of operational amplifier,a serial-connected PN junction structure is used in the circuit too.The bandgap reference is implemented in a standard TSMC 0.18 μm CMOS process.Simulation results using HSpice tools show that the circuit has a high Power Supply Rejection Ratio(PSRR)and low temperature coefficient.