Reference voltage source and method for providing a curvature-compensated reference voltage
First Claim
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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Abstract
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.
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Citations
20 Claims
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1. A reference voltage source, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of providing a reference voltage, comprising:
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providing a first collector current through a collector of a first bipolar device, wherein a value of the first collector current has a first temperature dependency, wherein the first collector current causes a first current density at an emitter of the first bipolar device; providing a second collector current through a collector of a second transistor, wherein the second collector current causes at an emitter of the second bipolar device a second current density, wherein the second current density is lower than first current density; and providing a third current through a collector of a third bipolar device, the third current provided by a modified Wilson current mirror connected to an emitter of the third bipolar device, wherein a gate of a control transistor of the modified Wilson current mirror is connected to the collector of the third bipolar device, and wherein a value of the third current has a second temperature dependency, wherein the second temperature dependency is different to the first temperature dependency.
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18. A reference voltage source, comprising:
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a bandgap voltage reference circuit having a first bipolar device, a second bipolar device, a first node and an output node, the output node being arranged for providing a reference voltage; and a curvature correction circuit having a third bipolar device, a base of the third bipolar device connected to the output node, a base of the first bipolar device, and a base of the second bipolar device, wherein; the curvature correction circuit comprises an output node connected to the first node of the bandgap voltage reference circuit, and 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. - View Dependent Claims (19, 20)
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Specification