Patent ID: 7248982
Filing Date: 2007-07-24
Classification: G01R,H04L

Abstract:
1. A method of measuring timing Data Dependent Jitter for a digital signal in a System Under Test, comprising the steps of: (a) processing consecutively sampled values of an instance of a bit pattern in the digital signal to produce an Acquisition Record; (b) measuring times of occurrence of consecutive edges in the Acquisition Record to form a corresponding Original Time Interval Error Record; (c) specifying, for a current bit in the digital signal at which amounts of timing Data Dependent Jitter are to be associated, a collection of bit positions relative to the current bit and which may influence the value of timing Data Dependent Jitter occurring at the current bit; (d) traversing the Acquisition Record of Step (a) to produce an independent variable sequence whose elements are instances of a current bit's logic value and the logic values of that current bit's associated collection of relative bit positions of step (c); (e) traversing the Original Time Interval Error Record to find a dependent variable sequence of Time Interval Error values, each value of which is respectively associated with an instance of a current bit and its associated collection of relative bit positions of step (c); (f) subsequent to Steps (d) and (e), performing a regression to find coefficients for a computational model that produces the dependent variable sequence from the independent variable sequence; and (g) subsequent to step (f), outputting the coefficients found in step (f) and its associated computational model.