| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the measurement accuracy of a delay time of a measuring circuit by equalizing the delay time Tm of the measuring circuit pass to the delay time Td of a dummy circuit pass in the method for measuring the delay time Tpd(=Tm-Td) of the measuring circuit by subtracting the delay time Td of the dummy circuit pass of the constitution bypassing the measuring circuit from the delay time of the measuring circuit pass including the measuring circuit. SOLUTION: In order to meet the transition time of an output terminal Smo of the measuring circuit pass with the output terminal Sdo of a dummy circuit pass, a phase detection means 5 outputs a delay control signal 17, controls the delay time of a variable delay time circuit 4 connecting the input terminal Sdi of the dummy circuit pass. As the results, the delay time Tpd of the measuring circuit 8 is controlled to be the same as the delay time of the variable delay time circuit 4.</p> |
