A 2.1-ppm/°C all-MOSFET voltage reference with a 1.2-V supply voltage

Abstract

This paper presents an ultra-low temperature coefficient sub-threshold voltage reference, which is based on a novel compensation principle without using any resistors or operational amplifiers. Being implemented on a 0.18 µm standard CMOS process, the post-layout simulation results show that the proposed design achieves a minimum temperature coefficient (TC) of 2.1 ppm/°C over the temperature range of −40 °C to 100 °C with a 1.2 V supply voltage. This proposed design also shows the worst line regulation of 0.034%/V at room temperature, when the supply voltage varies from 1.2 V to 1.8 V. Due to the elimination of resistors and amplifiers, the circuit area is at least 91% less than existing designs.