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Differential signal but different start time

Question asked by alex_wong on Sep 16, 2019
Latest reply on Sep 16, 2019 by alex_wong

Recently I found my simulation on CLK/DQS have low Vix margin 

from waveform i seen the CLK signal do not fall and rise at the same time

and the time different about 60~90ps 


the CLK/CLK# traces are coupling, so there are no different in trace length.

Any idea about the reason?


attached a simplify DQS circuit and simulate waveform.