Temperature Independent Resistorless CMOS Voltage Reference

This paper present a method for generation of low supply voltage temperature independent voltage reference circuit using only MOSFET. This reference voltage is generated by the diode connected MOSFET. This voltage reference circuit has combination of Complementary to absolute temperature (CTAT) and Proportional to absolute temperature (PTAT) along with two stage Operational Amplifier (Op-Amp) to get high gain. The proposed design is simulated in Cadence-Virtuoso using TSMC 180nm technology. Designed circuit achieves a temperature coefficient of 62.31 ppm/° Celsius while line regulation is 0.3386 % and reference voltage variation is 0.508 %. Temperature changes from (0-100)° Celsius. Area occupied by proposed design is 3.058nm2 and Power consumption is 4.1489 mW at 27° Celsius.