| 摘要 |
If a phase difference between a synchronizing source signal F1 and a comparison signal F2 is higher than a first lower limit a or lower than a first upper limit b, a comparator 3 selects this phase difference, if the phase difference is not higher than the lower limit a, selects the lower limit a, and if the phase difference is not lower than the upper limit b, selects the upper limit b, and a divider 7A outputs a comparison signal F2 obtained by dividing a frequency of an output signal F0, to change a phase of the signal F2 so that if the phase difference is not higher than a second lower limit e lower than the lower limit a, the phase difference may become the lower limit a and, if the phase difference is higher than a second upper limit f higher than the upper limit b, the phase difference may become the upper limit b.
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