| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage detecting device using a semiconductor type pressure sensor, which minimizes the fluctuation of the offset voltage of a whole circuit and has excellent temperature characteristics. SOLUTION: A differential amplifier circuit 9 for is constituted of first, second, and third arithmetic amplifiers 9a, 9b, and 9c mounted on a circuit board 5, and the first and second arithmetic amplifiers 9a and 9b input first and second output voltages outputted by a semiconductor type pressure sensor 4, and the third arithmetic amplifier 9c inputs first and second amplified voltages outputted by the first and second arithmetic amplifiers 9a and 9b, and amplifies a difference between the first and second amplified voltages. A first integrated circuit 11 is constituted of the first and second arithmetic amplifiers 9a and 9b which are integrated into one package.
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