Clock extraction circuit

摘要

A clock extraction circuit includes an edge detection unit for detecting a phase at which a trailing edge or a leading edge of input data is coincided with each other, and a phase judgement unit for comparing an edge position of the detected input data and a position of an input clock and for putting a weight, wherein the weight is put so that a shifting amount of the input clock is varied depending on a difference between the edge position of the input data and the position of the input clock.