Design of Resistorless Low Temperature Coefficient Band Gap Reference Bias Circuit

Abstract

This paper describes a new band-gap reference (BGR) without resistors that can be fabricated in a 0.35μm technology. The differential amplifier is used to reduce the current mirror errors dependent on the supply voltage and temperature, so as to produce a temperature insensitive gain applied to the proportional to absolute temperature (PTAT) term in the reference. The simulation result indicates that the proposed BGR circuit has low temperature coefficient (TC) Results demonstrate that the bias voltage 1.24V has shown only 8 mV variation over the temperature range 0 to 110°C. The supply voltage used is 2.72V.