| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a signal detection circuit from being influenced due to noise, with an expensive structure having no filter circuit installed, and a substrate for sensor control with the signal detection circuit, to which detection signal from a sensor is inputted, in a detection device having the substrate for sensor control. <P>SOLUTION: The circuit unit 30 for a control for driving and controlling an NOx gas sensor 10, comprises specific wiring connecting between a heater circuit 11 and a heater terminals 21, and a reference potential section 25, that is arranged between an Ip2 cell detection circuit 13 and the specific wiring and becomes a predetermined reference potential. Thus, the reference potential section 25 isolates between the Ip2 cell detection circuit 13 and specific wirings, which prevents noise due to the current flowing in the specific wirings from infiltrating the Ip2 cell detection circuit. Consequently, signal detection accuracy by the Ip2 cell detection circuit 13 can be improved, without having to install a filter circuit. <P>COPYRIGHT: (C)2007,JPO&INPIT |
