Patent ID: 7873132
Filing Date: 2011-01-18
Classification: H03L,H04L

Abstract:
1. A method of recovering a clock signal from an input data signal, the clock signal having a clock cycle equal to one data bit period, comprising: identifying an earliest transition time position in a sequence of data signal transitions forming an eye pattern opening; identifying a latest transition time position in the sequence of data signal transitions forming the eye pattern opening; calculating an approximate average transition time position of the sequence of clock transitions forming the eye pattern opening based on the earliest transition time position and the latest transition time position; establishing a time in the sequence of data signal transitions forming the eye pattern opening representing the earliest transition time in the eye pattern opening; establishing a time in the sequence of data signal transitions forming the eye pattern opening representing the latest transition time in the eye pattern opening; finding a time half way between the earliest transition time and the latest transition time forming the eye pattern opening as the approximate average transition time; calculating a sampling time for sampling data in the input data signal as the approximate average transition time position plus one half clock cycle; and adjusting a sampling clock time to approximate the sampling time.