| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of the control of a correct pulse width being difficult, due to the quantity of delays of a delay buffer changes depending on a process variation or a temperature. SOLUTION: The fact that the number of stages of the delay buffer in an offset section A 23 is hardly affected by the process variation, and the temperature and is always fixed, is utilized. The number of stages of a delay buffer obtained by subtracting the number of stages of the delay buffer in a offset section A23 from the number of stages of a delay buffer in a section, where a detection counter 2n turns into n is determined, and the number of stages of a delay buffer for one cycle of a reference clock is determined. The number of stages of the delay buffer for one cycle of the reference clock can be determined automatically, by automatically detecting the number of stages of the delay buffer in the offset section A23.
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