Design of a low voltage high precision CMOS bandgap reference

A novel curvature compensated low voltage high precision CMOS bandgap reference is introduced in this paper. It adopts a self-biased low-voltage operational amplifier and the specific voltage transfer cell to achieve the features of low power supply and low temperature coefficient with better curvature compensation. A T-type resistor network is designed to reduce the total resistances and therefore to lower the chip area. We simulate the circuit using the Cadence Hspice based on SMIC 0.18 um model. The simulation results show that the circuit has an accuracy of 6.8 ppm/degC with the range from -35degC to 110degC, a power supply rejection ratio (PSRR) of -90 dB and low power consumption of 36.46 uW.