| 摘要 |
PROBLEM TO BE SOLVED: To provide a temperature measuring circuit capable of measuring a temperature easily and highly accurately. SOLUTION: This circuit includes first and second current supply lines connected to a temperature sensor whose resistance value is changed by the temperature; first and second constant current sources connected to the first and second current supply lines respectively, for supplying a constant current to the current supply lines; a voltmeter for measuring a voltage difference between the first supply line and the second supply line; and an operation part for determining a mean value between a first voltage value measured by the voltmeter when the first constant current source is connected to the first current supply line and the second constant current source is connected to the second current supply line, and the second voltage value measured by the voltmeter when the second constant current source is connected to the first current supply line and the first constant current source is connected to the second current supply line, and determining the temperature detected by the temperature sensor. COPYRIGHT: (C)2009,JPO&INPIT
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