Jitter tolerance improvement by phase filtration in feed-forward data recovery systems

Abstract From the Canadian patent

Over-sampled timing signal jitter tolerance is improved in a q-times over-sampled architecture by phase-sampling the timing signal to produce a plurality of input phase samples ~in where ~in .epsilon. {~1,~2,...~q). An output phase value ~out = ~in is initialized for each input sample ~in. A difference vector d i is derived for each input sample ~in where d i = F j(n,k). F denotes a vector operation n is the number of input samples, k is a pre-defined threshold value and j represents a filter order value. A predefined scaling coefficient ai is applied to each difference vector d i to produce a corresponding set of scaled difference vectors a i d i. The scaled difference vectors are summed: …