DESIGN AND IMPLEMENTATION OF VOLTAGE REFERENCE CIRCUIT FOR LOW VOLTAGE APPLICATIONS

Abstract

This work presents a second-order low power bandgap voltage reference (BGR) circuit for temperature range of -40 to 100 °C and for supply voltage of 1-3 V. The bandgap circuit uses MOS transistors operating in subthreshold region, DTMOST for generating currents. Use of the current conveyor makes the circuit capable of being operated at lower supply voltage. The bandgap voltage is obtained through a mixed-mode topology, which has the added flexibility for obtaining high precision second order temperature compensation. The circuit is designed in 0.5u BiCMOS process. The reference voltage obtained is 1.86V using subthreshold circuit and 262mv using combination of current conveyor and DTMOST at room temperature. This circuit finds application in high precision analog and digital circuits. This work presents a second-order low power bandgap voltage reference (BGR) circuit for temperature range of -40 to 100 °C and for supply voltage of 1-3 V. The ba...