Patent ID: 9128497
Filing Date: 2015-09-08
Classification: G05F

Abstract:
1. A temperature compensation based voltage reference circuit, comprising a positive temperature coefficient generating unit, a negative temperature coefficient generating unit, a temperature compensation circuit, mirror circuit and a voltage divider, wherein; the positive temperature coefficient generating unit generates a positive temperature coefficient voltage comprising Item T ln (T), and outputs a positive temperature coefficient current comprising Items T and T ln (T); the negative temperature coefficient generating unit generates a negative temperature coefficient voltage comprising Item T ln (T), and outputs a positive temperature coefficient current comprising Item T; the temperature compensation circuit converts a positive temperature coefficient current comprising Items T and T ln (T) into a positive temperature coefficient voltage comprising Items T and T ln (T), and compensates negative temperature coefficient voltage comprising Items T and T ln(T) generated by negative temperature coefficient generating unit, which, together with temperature compensation circuit, generates a reference voltage with zero temperature coefficient; Wherein, T is absolute temperature; the mirror circuit multiplies output current from the negative temperature coefficient generating unit by a factor of m, which is then input into the positive temperature coefficient generating unit; the voltage divider adjusts output voltage and calculates operating voltages of both positive and negative temperature coefficient generating units.