[SI-LIST] Impedance continuity in a GSSG stackup - looking for references

From: Chris Maryan <kmaryan@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Date: Fri, 30 Aug 2013 11:41:08 -0400

Hi All,
Is anyone aware of any references that explore impedance continuity in a
GSSG stackup. Given a stackup that's composed of Gnd - SigA - SigB - Gnd,
what is the impact of traces or density of traces on the SigB layer on the
impedance of traces on SigA. Effectively, how densely can I cram traces
overtop of each other, what are the general rules for working with this
kind of layout, and what are the rules of thumb for understanding the
impact on impedance, crosstalk, etc.
Am I right in assuming that Hyperlinx (and presumably other 2/2.5D
simulators) doesn't look at the impedance impact of overlapping traces?
(Even if the SigB traces are so dense that they practically form a
continuous plane at that layer.) And that crosstalk seems to be properly
modelled between the A and B layers.

Thanks,

Chris


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[SI-LIST] Impedance continuity in a GSSG stackup - looking for references

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