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When the spacing between the traces is too narrow, the EM fields of the traces will interact and the signals on the traces become corrupted . Crosstalk can be corrected by increasing the spacing between the spacing between tracks.
Many ‘rules of thumb’ have been published over the years about what is an acceptable spacing between conductors. A common rule is the 3W rule where the spacing between traces must be at least three times the width of the trace.
Well, some standard practices below...
A. Try to maintain 3W spacing between identified aggressor trace and other traces (3 times the trace width of aggressor measured from center of the trace)
B. Do not run traces in parallel for a long distance (what's long... depends on switching speed of aggressor.. Google for Critical length of Electrical Signals)
C. If space and cost permit, series terminate the aggressor trace.
D. Shielding trace is a waste of board space
E. Try to maintain the aggressor trace in a separate layer- yes this is a bit tough task in dense cards
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