Phase comparator, phase comparator, and clock data recovery system

摘要

The comparison period detector (11) defines a period between the rising edge of the first clock signal and the rising edge of the second clock signal as a comparison period, and detects the presence / absence of a data signal transition during the comparison period. The phase relationship detection unit (12) detects the phase relationship between the data signal and the reference clock signal. When the comparison period detection unit (11) detects a transition of the data signal during the comparison period, the phase relationship detection unit (12) Output.