Curvature-compensated BiCMOS bandgap with 1-V supply voltage

Abstract

We present a bandgap circuit capable of generating a reference voltage of 0.53 V. The circuit, implemented In a submicron BiCMOS technology, operates with a supply voltage of 1 V, consuming 92 /spl mu/W at room temperature. In the bandgap circuit proposed, we use a nonconventional operational amplifier which achieves virtually zero systematic offset, operating directly from the 1-V power supply. The bandgap architecture used allows a straightforward implementation of the curvature compensation method. The proposed circuit achieves 7.5 ppm/K of temperature coefficient and 212 ppm/V of supply voltage dependence, without requiring additional operational amplifiers or complex circuits for the curvature compensation.