| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that circuit scale is enlarged or a defect is erroneously detected in a conventional defect detecting circuit. SOLUTION: The defect detecting circuit includes a detecting circuit 52 detecting quantity of change in an amplitude level of an input signal and outputting it as a tilt detecting signal, a comparing voltage control circuit 54 changing a level of comparing voltage Vcomp in accordance with an amplitude level of the input signal, and a comparing circuit 53 comparing a level of the tilt detecting signal with a level of the comparing voltage Vcomp and outputting a control signal. COPYRIGHT: (C)2008,JPO&INPIT
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