CMOS Proportional-to-Absolute Temperature Current Reference for Low Voltage Operation

Abstract

A CMOS Proportional-to-Absolute Temperature current reference for low voltage operation is presented. The proposed circuit can work with supply voltages as low as 1.1 V. The circuit is designed in 90 nm CMOS technology for 2.2 μA reference current at typical corner, 27 C, 1.2 V. It has been extensively simulated across all possible combinations of MOSFET, Resistor, BJT, supply voltage and temperature variation corners. Simulation results have been given for a wide temperature variation from ―40 C to 125 C and supply voltage variation from 1.1 V to 1.3 V. Extensive Monte-Carlo mismatch simulation results show that the circuit is quite robust to the device mismatch yielding low variation in the output reference current.