A 1-V 3.1-ppm/°C 0.8-μW Bandgap Reference with Piecewise Exponential Curvature Compensation

Abstract

This paper presents a low-power precision BGR, which is realized with a current-mode BGR compensated by a piecewise exponential current generated by three simple differential MOS pairs. Fabricated in a 0.18-μm CMOS process, measured results show that the BGR achieves average and best TCs of 7.08 and 3.1 ppm/°C after trimming, respectively, in the range of -40 to 125°C, and a Une sensitivity of 0.03%/V in a supply voltage ranges from 1 to 3V. The current consumption is 0.8 μA under a 1-V supply.