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US 2011/0032023 A1Published application
Temperature detection circuit
AssigneeNEC Electronics Corporation
InventorMakoto TANAKA
Life of this patent
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Abstract
A temperature detection circuit includes, a first source follower circuit supplied with a first constant current, a second source follower circuit supplied with a second constant current, and a circuit obtaining a difference between an output voltage from the first source follower circuit and an output voltage from the second source follower circuit. Measurement errors attributable to transistor threshold voltages are canceled out by obtaining a difference between output voltages.
Claims12
A temperature detection circuit comprising:
- a first source follower circuit supplied with a first constant current;
- a second source follower circuit supplied with a second constant current;
- and
- a circuit obtaining a difference between an output voltage from the first source follower circuit and an output voltage from the second source follower circuit.
1 more element
A temperature detection circuit comprising:
- a first source follower circuit comprising cascaded source follower transistors each supplied with a predetermined constant current;
- a second source follower circuit comprising cascaded source follower transistors, the number of which is the same as that of the source follower transistors included in the first source follower circuit and each of which is supplied with a predetermined constant current;
- and
- a circuit obtaining a difference between an output voltage from the first source follower circuit and an output voltage from the second source follower circuit.
1 more element
Dependencies are inferred from the claim text.