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US 2021/0278288 A1Published application
Thermal sensor circuit
AssigneeSTMicroelectronics S.r.l.
InventorsPhilippe GALY, Renan LETHIECQ
Life of this patent
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Abstract
An electronic device includes a module that delivers a positive temperature coefficient output voltage at an output terminal. A thermistor includes a first MOS transistor operating in weak inversion mode and having a negative temperature coefficient drain-source resistance and whose source is coupled to the output terminal. A current source coupled to the output terminal operates to impose the drain-source current of the first transistor.
Claims22
A temperature sensing circuit, comprising:
- a thermistor comprising a first MOS transistor having a first drain, a first source, a first gate, a first body and a first back gate, wherein the first MOS transistor is configured to operate in weak inversion mode with a negative temperature coefficient drain-source resistance;
- an output terminal coupled to the first source and configured to generate a positive temperature coefficient output voltage;
- and
- a current source comprising a second MOS transistor having a second drain, a second source, a second gate, a second body and a second back gate, wherein the second gate is coupled to the first source and configured to impose a drain-source current of the first MOS transistor;
- and
- wherein the first body and second body are floating, and wherein the first back gate and the second back gate are directly electrically connected to a ground node.
3 more elements
Dependencies are inferred from the claim text.