Phase Difference Detector And Phase Difference Detection Method

Abstract

A phase difference detector for detecting a phase difference between input clocks which both have a same first frequency, including: a pulse width conversion unit for converting the input clocks into a phase difference signal indicating by a pulse width a phase difference between the input clocks; and a counter unit which samples a level of the phase difference signal using a reference clock having a second frequency which is slower than the first frequency, and counts the number of levels of the phase difference signal using a first weighting according to the sampled level of the phase difference signal. When the count value of the counter unit transits in a predetermined range, the phase difference between the input clocks is detected according to the first weighting.

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