Mike Li, Principle Architect/Distinguished Engineer, Altera Corporation
Masashi Shimanouchi, Senior Member of Technical Staff, Altera Corporation
Daniel Chow ,Senior Member of Technical Staff, Altera Corporation

Although crosstalk is a hot topic in signal integrity and has been studied extensively, crosstalk jitter (XTJ) separation under generic signaling conditions remains a largely unsettled/unsolved subject, which this paper aims at solving. In the new method, both correlated and uncorrelated XTJ separations are covered. Correlated XTJ is separated by subtracting the intrinsic correlated timing deviation from the total correlated timing deviation, with the timing deviation estimated from the corresponding waveform. Uncorrelated XTJ is separated by fitting the small probability tail regions of the jitter probability density function (PDF) with an unbounded uncorrelated Gaussian (i.e., manifesting the true random jitter process) combined with an bounded uncorrelated Gaussian (i.e., manifesting the uncorrelated XTJ process), or of the jitter cumulative distribution function (CDF) with an integrated unbounded uncorrelated Gaussian combined with an bounded uncorrelated Gaussian. The accuracy of the new XTJ separation method is verified with both simulations and experiments that mimic the practical applications.