Method for BGR's Second-Order Temperature Compensation Using Resistor Combinations with Specified Temperature Coefficients

Abstract

In this paper, an original method is proposed to implement temperature compensation for a bandgap reference(BGR) circuit without any auxiliary circuits. By employing resistor combinations(formed by different type of resistors) with specified temperature coefficients(TC), the temperature coefficient of a previous reported bandgap reference is improved from 22.11 ppm/^oC to 3.499ppm/^oC(-25^oC - 85^oC).In order to accomplish the improvement, a useful model is also proposed to help understand the relationship among the TCs of resistors' combinations and BGR.