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US 2017/0108884 A1Published application
Wheatstone bridge sensing system with multiple current sources
AssigneeSemiconductor Components Industries, LLC
InventorJacques Jean BERTIN
Life of this patent
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Abstract
A system, in some embodiments, comprises: a multi-resistor Wheatstone bridge supplied by a first current source; and a second current source coupled to the bridge and configured to at least partially compensate for a voltage detected by an analog-to-digital converter (ADC), said voltage indicative of an alteration of a physical parameter affecting the bridge, wherein the ADC produces a digital code that represents said voltage.
Claims20
A system, comprising:
- a multi-resistor Wheatstone bridge supplied by a first current source;
- and
- a second current source coupled to the bridge and configured to at least partially compensate for a voltage detected by an analog-to-digital converter (ADC), said voltage indicative of an alteration of a physical parameter affecting the bridge,
- wherein the ADC produces a digital code that represents said voltage.
1 more element
A system, comprising:
- a Wheatstone bridge having first and second nodes;
- a current source supplying current to said bridge;
- a static current source configured to at least partially compensate for an offset current associated with the bridge, if any;
- a variable current source configured to sink current received from the first node and to provide current to the second node;
- and
- an analog-to-digital converter (ADC) configured to detect a voltage indicative of an alteration of a physical parameter affecting the bridge and to affect the current provided by the variable current source based on the detected voltage,
- wherein the ADC is further configured to provide a digital code based on said detected voltage.
4 more elements
A method, comprising:
- providing current from a first current source to a Wheatstone bridge;
- detecting a voltage indicative of an alteration of a physical parameter affecting the bridge;
- providing current from a second current source to the bridge based on the detected voltage;
- and
- providing a value, based on the detected voltage, that indicates said alteration of the physical parameter.
2 more elements
Dependencies are inferred from the claim text.