CLOCK RECOVERY USING A TAPPED DELAY LINE

摘要

A method for recovering a clock from a received data signal, the method comprising: receiving a data signal carrying a series of symbols; generating a clock signal in dependence on the data signal; sampling the received data signal at the frequency of the clock signai so as to form a sequence of values dependent on the sampled level of the received data signal, the sequence including first and second values that are adjacent in the sequence; sampling the signal at a further sample time between the times of the first and second samples to form a further value; forming a phase error indicator by estimating the difference between the further value and a representation of the contributions of the symbols indicated by at least one of the values of the sequence to the signal at the further sample time; and adjusting the phase of the clock signal in dependence on the phase error indicator.