Patent ID: 7724856
Filing Date: 2010-05-25
Classification: H04L

Abstract:
1. A clock recovery circuit for recovering a symbol clock from a detection signal obtained by detecting a modulation signal, comprising: an in-phase component processing unit operable to generate a phase error information signal with reference to an in-phase component signal generated from the detection signal, a quadrature component processing unit operable to generate a phase error information signal with reference to the quadrature component signal generated from the detection signal, and a clock generation unit, wherein the in-phase component processing unit and the quadrature processing unit each include an N-interval detection unit operable to detect an N zero-crossing interval with reference to N+1 zero-crossing signals obtained from the input signal, where N is an integer greater than or equal to 2; a judgment unit operable to judge whether the N zero-crossing interval is within a predetermined interval range; and the clock generation unit generates a symbol clock by performing timing adjustment according to the phase error information signal that is output according to whether the result of the judgment is affirmative or negative.