| http://www.w3.org/ns/prov#value | - adding N to the second accumulative value in each period of the reference clock signal, outputting an estimative phase error according to the second accumulative value, wherein N is a real number greater than 0; a comparator, outputting a frequency correction signal according to the detected phase error, the first accumulative value, and the estimative phase error; and an output unit, providing t
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