| 摘要 |
PROBLEM TO BE SOLVED: To suppress the distortion of a detection output waveform in a detection device, in which a resonance frequency of a receive coil and a resonance capacitor is adjusted by using an adjustment capacitor. SOLUTION: The detection circuit device includes: a receive frequency adjustment unit formed of a first terminal 3, a second terminal 4, a reference terminal 5, a first adjustment capacitor 6a prepared between the first terminal 3 and the reference terminal 5, a second adjustment capacitor 6b prepared between the second terminal 4 and the reference terminal 5, a first switch 9a connected with the first adjustment capacitor 6a in a position between the first terminal 3 and the reference terminal 5, and a second switch 9b connected with the second adjustment capacitor 6b in a position between the second terminal 4 and the reference terminal 5; a first control circuit 12a for controlling the operation of the first switch 9a; and a second control circuit 12b for controlling the operation of the second switch 9b. COPYRIGHT: (C)2009,JPO&INPIT
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