Temperature coefficient of offset compensation for resistance bridge
AssigneeQorvo US, Inc.
InventorsMong Yang, Julius Minglin Tsai
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Abstract
Systems and methods for temperature coefficient of offset compensation for a resistance bridge are disclosed. In one aspect, one or more current sources are added in parallel to resistance elements within a resistance bridge. The current source(s) may be selectively switched on and adjusted by a control circuit based on readings from a temperature sensor. In this fashion, the temperature induced variations in the resistance may be canceled or corrected allowing for better performance of the resistance bridge.
Claims16
A pressure sensor, comprising:
- a resistance bridge comprising:
- a first resistor positioned between a first terminal node and a second terminal node;
- a second resistor positioned between the first terminal node and a third terminal node;
- a third resistor positioned between the second terminal node and a fourth terminal node;
- and
- a fourth resistor positioned between the third and fourth terminal nodes;
- at least one current source associated with and electrically parallel to a respective one of the first through fourth resistors;
- and
- a switch associated with the at least one current source and configured to couple selectively the at least one current source to the respective one of the first through fourth resistors.
A device comprising:
- a pressure sensor comprising:
- a resistance bridge comprising:
- a first resistor positioned between a first terminal node and a second terminal node;
- a second resistor positioned between the first terminal node and a third terminal node;
- a third resistor positioned between the second terminal node and a fourth terminal node;
- and
- a fourth resistor positioned between the third and fourth terminal nodes;
- at least one current source associated with and electrically parallel to a respective one of the first through fourth resistors;
- and
- a switch associated with the at least one current source and configured to couple selectively the at least one current source to the respective one of the first through fourth resistors;
- a temperature sensor;
- and
- a control circuit configured to receive a signal from the temperature sensor and control the switch and the at least one current source to compensate for temperature variations based on the signal.
A method for compensating for temperature variations in a pressure sensor, the method comprising:
- detecting a temperature with a temperature sensor;
- and
- selectively coupling a current source to a resistor in a resistance bridge based on the temperature.
Dependencies are inferred from the claim text.