A simple curvature-compensated technique for CMOS bandgap voltage reference

Abstract

A simple high-order curvature-compensated technique for CMOS bandgap voltage reference (BVR) is presented and its advantage over the conventional ones is that this technique needs no extra circuitry for curvature compensation. The experimental prototype circuit is fabricated in CSMC 0.18µm CMOS process and occupies an area of 0.053mm². A temperature coefficient (TC) of 10.1ppm/°C is achieved with temperature ranging from -40°C to 120°C under 3V power supply. The line regulation of the output reference is only 0.85mV/V.