| 摘要 |
PURPOSE:To obtain a signal detecting circuit provided with an offset compensation function by which an offset amount is not erased even when a power source is cut off, by storing an offset voltage in an rewritable read only memory circuit. CONSTITUTION:An offset voltage is generated in response to the dispersion in characteristics and the like of the respective elements of a bridge circuit 1 and a differential amplifier 6 of a pressure sensor and the like. Said offset voltage is written and stored in a rewritable ROM10 through an A/D converter 7, a switch 8, and the like. When the switch 8 is switched, the detected output from the A/D converter is processed by a subtractor 11 in correspondence with the contents of the ROM10 through a data holding circuit 9, and the offset is compensated. In this constitution, wherein the rewritable ROM is used as a memory, a signal detecting circuit provided with an offset compensating function by which the offset amount is not erased even though a power source is cut off, can be obtained. |
