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US 9,804,036 B2Granted
Temperature sensor calibration
AssigneeInfineon Technologies AG
InventorFan Yung Ma
Life of this patent
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Abstract
Representative implementations of devices and techniques provide calibration for a chip-based temperature sensor. Two or more measurements are taken using a high resolution temperature sensor digitizer, and used to determine a calibration for the temperature sensor, based on a reference temperature value calculated from the measurements.
Claims21
An apparatus, comprising:
- one or more bipolar devices arranged to provide a first analog input and a second analog input, wherein the second analog input is based on a difference in base-emitter voltages of the one or more bipolar devices;
- an analog-to-digital converter (ADC) arranged to compare the first analog input and the second analog input;
- and
- a multiplexer arranged to substitute an external reference voltage for the second analog input, wherein the ADC is further arranged to:
- compare the first analog input and the external reference voltage;
- output a first digital result based on comparing the first analog input and the second analog input;
- output a second digital result based on comparing the first analog input and the external reference voltage;
- and
- output a third digital result representing a reference temperature based on the first digital result, the second digital result, and the external reference voltage.
6 more elements
A method, comprising:
- providing a first analog input and a second analog input from at least one bipolar device of a digital temperature sensor, wherein the second analog input is based on a difference in base-emitter voltages of the at least one bipolar device;
- receiving the first analog input and the second analog input at an analog-to-digital converter (ADC) of the digital temperature sensor;
- taking a first measurement with the digital temperature sensor to get a first digital result;
- substituting an external reference voltage for the second analog input;
- taking a second measurement with the digital temperature sensor to get a second digital result;
- determining the difference in the base-emitter voltages of the at least one bipolar device based on the first digital result and the second digital result;
- and
- determining a reference temperature based on the difference in the base-emitter voltages of the at least one bipolar device.
5 more elements
Dependencies are inferred from the claim text.