| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of determining the matching or non-matching between the phase of a shift clock and the phase of a delay clock, even when phase jitters in the linearizing operation of a variable delay circuit are included when the shift clock is used. SOLUTION: The phase of the shift clock is made to match with the offset phase of the delay clock to detect the offset, and path selection data in the offset detection are stored in a linearization memory. The phase of the shift clock is shifted in a normal direction by clock resolution portion, and the phase of the delay clock is shifted in reverse in the direction opposite to the normal direction once. The phase of the shift clock is then compared with the phase of the delay clock, the path selection data are changed to shift the phase of the delay clock in the normal direction, until both the phases match, and the path selection data in the matching of both the phases are stored in the linearization memory.
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