| 摘要 |
PROBLEM TO BE SOLVED: To provide a temperature characteristics correction circuit that applies analog processing to a signal changed, in proportion to an absolute temperature for correcting the temperature without having to use a thermistor. SOLUTION: The temperature characteristics correction circuit is provided with 1st current sources 3, 4, that supply a 1st current 11 proportional to an absolute temperature and is inversely proportional to the resistance of resistors R1-R4, and with a 2nd current source 5 that supplies a 2nd current I2 inversely proportional to the resistance, the 1st current is used for a bias current, used to apply logarithmically compression to the 2nd current and the 2nd current is used for a bias current, employed for logarithmically extending the voltage subjected to logarithmic compression. The gain of the voltage subjected to logarithmic extension with respect to the input voltage is made proportional to a ratio of the 2nd current to the 1st current, so as to provide a gain which is inversely proportional to the absolute temperature.
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