| 摘要 |
PROBLEM TO BE SOLVED: To quantitatively grasp an amplitude of a measured clock jitter to enhance evaluation precision of a measured device. SOLUTION: Comparators 14-1 to 14-6 compare measured clocks from a measured device 2 with an expected value in each rise of timing signals T1 to T6, and binary data in response to compared results thereof are stored in a storage element of a register 15 in order. The binary data stored in the register 15 expresses a time axis-directional swinging amount of an edge of the measured clock, i.e., an amplitude amount of the jitter of the measured clock. When the binary data stored in a memory 17 reach to a prescribed amount, a jitter amplitude calculating part 18 conducts FFT processing for the binary data to calculate a jitter amplitude in a specified jitter frequency.
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