A new curvature-compensated, high-PSRR CMOS bandgap reference

This paper presents a new curvature-compensated CMOS bandgap reference topology with a high power supply reject ratio (PSRR). A dual-differential input amplifier (DDIA) is used to generate a complementary to absolute temperature voltage. This voltage and the DDIA are then used to fine-tune its curvature compensation. Experimental characterization of the bandgap reference circuit implemented on a 0.5 µm CMOS process yielded a bandgap reference voltage with a temperature coefficient (TC) of 4.1 ppm/°C across the temperature range of ?40 to 125 °C. A PSRR of 82 dB was also realized with a high output load current driving ability without the use of an external buffer amplifier.