A 1.2 V supply 0.58 ppm/°C CMOS bandgap voltage reference

Abstract

A precision curvature-compensated bandgap reference (BGR) is proposed and implemented using a standard 0.18-µm CMOS process. With a new and precise circuit configuration, the thermal nonlinearity of emitter-base voltages can be fully compensated, achieving an ultra-low temperature coefficient (TC) of 0.58 ppm/°C from −40 °C to 110 °C. The minimum required supply voltage is 1.2 V and the current consumption at 27 °C is 48 µA. At 27 °C, the line regulation performance is 0.015%/V with a supply voltage range of 1.2 V to 1.8 V.