System and method for regenerating clock signal

Abstract

A clock-signal regenerating system for regenerating a clock signal by feeding back a phase difference between a demodulated analog data signal and a clock signal includes: an A/D converter for over-sampling the demodulated analog data signal to convert it into a digital signal; a data-change-direction detecting circuit for deciding a change in data sampled at its peak positions, to detect whether the data changed in an ascending direction or a descending direction; a threshold selecting circuit for holding a threshold and deciding a positive/negative sign of data sampled at its zero-crossing positions, to select the threshold; a phase-difference detecting circuit for comparing the data of the demodulated analog data signal sampled at the zero-crossing position to the selected threshold, to detect sampled data in excess of the threshold as a phase difference; and a multiplier for multiplying thus detected phase difference by data in thus detected data-change direction, to obtain a resultant phase difference.

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