| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid pressure detecting circuit allowing fluid pressure, if having a small variation, to be subjected to further digital processing with a high resolution by amplifying the variation of the fluid pressure after picked out. SOLUTION: An output signal S-A detected by a pressure detecting element 22 is transformed into a differential signal S-B by a differential circuit 24, and an integration circuit 25 outputs an integration signal S-C for which the variation component of fluid pressure is only integrated. An amplification signal SD amplified by an amplifying circuit 26 is transformed into an offset signal SE having a positive value by an offsetting circuit 27. The fluid pressure itself detected by the pressure detecting element 22 is formed into a temperature compensate signal Pr1 by a temperature compensating circuit 23 and processed by a digital circuit. Pressure variation, if having a small value is outputted as a temperature not-compensated signal Pr2 after amplification and offset and precisely detected by the digital circuit with a resolution.
|
