PROBLEM TO BE SOLVED: To accurately measure the delay amount of a delay element.;SOLUTION: The delay circuit comprises: a first delay element; a second delay element; and an initialization part for measuring the delay amount generated to each delay setting value by the first delay element and initializing the first delay element. The initialization part comprises: a first loop route for inputting the output signals of the first delay element to the first delay element; a second loop route for inputting the output signals of the second delay element to the second delay element; a first measurement part for successively setting a different delay setting value to the first delay element and successively measuring the delay amount of the first delay element; a second measurement part for measuring the delay amount in the second delay element in synchronism with the first measurement part without changing the delay setting value of the second delay element; and a delay amount calculation part for correcting the delay amount measured by the first measurement part by using the delay amount measured in synchronism with the delay amount by the second measurement part.;COPYRIGHT: (C)2008,JPO&INPIT
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