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

  • US 9,442,508 B2
  • Filed: 03/05/2012
  • Issued: 09/13/2016
  • Est. Priority Date: 03/05/2012
  • Status: Active Grant
First Claim
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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; and

    wherein 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.

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