A 443-µA 37.8-nV/√Hz CMOS multi-stage bandgap voltage reference

Abstract

A CMOS bandgap voltage reference is presented, which achieves a low integrated noise of 150nVrms within a 0.1-10Hz bandwidth and a 37.8nV/√Hz wideband noise floor above 100Hz. The low noise performance is accomplished by employing a multi-stage bandgap topology, which results in an inherent noise advantage compared to a conventional CMOS bandgap. Fabricated in a 0.35μm HV CMOS technology, the bandgap voltage reference consumes 443μA from a nominal 3.4-V supply and occupies 0.5mm2 chip area.