| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly accurate and reliable pressure sensor circuit capable of canceling out the output offset of an amplifier and obtaining correct output even if external environments such as the passage of time, humidity and the like change. SOLUTION: This pressure sensor circuit is provided with switches S1-S6 as means to reduce the output offset voltage of an amplifier 13 contained in the output voltage V1 of the amplifier 13, and a switching control part to turn on the switches S1, S3, S4 and S6 and off the switches S2 and S5 at the time when input to the amplifier 13 is inhibited in an auto zero state, and to turn on the switches S2, S3, and S5 and off the switches S1, S4, and S6 at the time when input to the amplifier 13 is permitted, and to turn off the switch S3 at the time of a transition from the time when input is permitted to the time of inverse integration. The switching control part is provided for a control part 14b. |
