Reference voltage source and method for providing a curvature-compensated reference voltage

摘要

A reference voltage source comprises a bandgap voltage reference circuit having a first node and an output node, the output node being arranged for providing a reference voltage. A curvature correction circuit has an input node connected to the output node and/or to a base of a first bipolar device of the bandgap voltage reference circuit and/or to a base of a second bipolar device of the bandgap voltage reference circuit. The curvature correction circuit has an output node connected to the first node of the bandgap voltage reference circuit. The curvature correction circuit comprises a current source for providing a current having a different temperature dependency than a temperature dependency of a first current through the first bipolar device of the bandgap voltage reference circuit.

主权项

1. A reference voltage source, comprising:
a bandgap voltage reference circuit having a first node and an output node, the output node being arranged for providing a reference voltage; and a curvature correction circuit having an input node connected to one or more of the output node, a base of a first bipolar device of the bandgap voltage reference circuit, and a base of a second bipolar device of the bandgap voltage reference circuit, wherein;
the curvature correction circuit comprises an output node connected to the first node of the bandgap voltage reference circuit,the curvature correction circuit comprises a current source for providing a current having a different temperature dependency than a temperature dependency of a first current through the first bipolar device of the bandgap voltage reference circuit; andwherein the current source comprises a modified Wilson current mirror, wherein a gate of a control transistor of the modified Wilson current mirror is connected to a collector of a third bipolar device and an output node of the modified Wilson current mirror is connected to an emitter of the third bipolar device.