A 3 V 110 μW 3.1 ppm/°C curvature-compensated CMOS bandgap reference

This paper presents design of a high-precision curvature-compensated bandgap reference (BGR) circuit implemented in a 0.35 mu m CMOS technology. The circuit delivers an output voltage of 1.09 V and achieves the lowest reported temperature coefficient of similar to 3.1 ppm/degrees C over a wide temperature range of [-20 degrees C/+100 degrees C] after trimming, a power supply rejection ratio of -80 dB at 1 kHz and an output noise level of 1.43 mu V root Hz p at 1 kHz. The BGR circuit consumes a very low current of 37 mu A at 3 V and works for a power supply down to 1.5 V. The BGR circuit has a die size of 980 mu m x 830 mu m.