Temperature sensor and calibration method thereof having high accuracy
AssigneeNXP USA, Inc.
InventorsBirama Goumballa, Didier Salle, Olivier Doare, Cristian Pavao Moreira
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Abstract
Disclosed is a temperature sensor including a first current generator configured to generate a proportional to absolute temperature (PTAT) current, a second current generator configured to generate an inverse PTAT (IPTAT) current, the PTAT current and IPTAT current being combined to form a reference current having a sensitivity relative to temperature, a plurality of current mirrors to adjust the sensitivity and gain of the reference current, and a variable resistor to set an output calibration voltage based on the generated current.
Claims15
A temperature sensor, comprising:
- a first current generator first voltage source in a first circuit portion having a first value configured to generate a proportional to absolute temperature (PTAT) current;
- a second current generator configured to generate an inversely proportional to absolute temperature (IPTAT) current, the PTAT current and IPTAT current being combined to form a reference current having a sensitivity relative to temperature;
- a first voltage source in a first circuit portion having a first value to generate the PTAT current and IPTAT current;
- a second voltage source in a second circuit portion having a second value higher than the first value configured to calibrate a high output voltage;
- a plurality of current mirrors comprising one or more first current mirrors configured to adjust the sensitivity of the reference current and one or more second current mirrors connected to receive the reference current and to produce a generated current;
- and
- a variable resistor configured to generate an output voltage based on the generated current, the output voltage having a magnitude that corresponds to a temperature value.
A method of calibrating a temperature sensor, comprising:
- generating a proportional to absolute temperature (PTAT) current using a first current generator of the temperature sensor which is connected to a first voltage source in a first circuit portion having a first value to generate the PTAT current;
- generating an inversely proportional to absolute temperature (IPTAT) current using a second current generator of the temperature sensor which is connected to the first voltage source in a first circuit portion having a first value to generate the PTAT current, the PTAT current and IPTAT current being combined to form a reference current having a sensitivity relative to temperature;
- adjusting the sensitivity of the reference current to produce an adjusted current;
- and
- generating an output voltage based on the adjusted current using a second voltage source in a second circuit portion having a second value higher than the first value configured, the output voltage having a magnitude that corresponds to a temperature value.
A temperature sensor, comprising:
- a first current generator configured to generate a proportional to absolute temperature (PTAT) current;
- a second current generator configured to generate an inversely proportional to absolute temperature (IPTAT) current, the PTAT current and IPTAT current being combined to form a reference current having a sensitivity relative to temperature;
- a plurality of current mirrors configured to adjust the sensitivity of the reference current to produce a generated current;
- a first voltage source in a first circuit portion having a first value to generate the PTAT current and IPTAT current;
- a second voltage source in a second circuit portion having a second value higher than the first value configured to calibrate an output voltage;
- and
- a variable resistor configured to generate the output voltage based on the generated current, the output voltage having a magnitude that corresponds to a temperature value.
Dependencies are inferred from the claim text.