Victor, a few months ago I think I mentioned that betwee-layer registration is, to my knowledge, a factor affecting impedance of differential transmission line impedance when the two conductors are not in the same plane.  This configuration is rare compared to that of both conductors in the same plane, as far as I can tell.

Impedance mismatch at terminations would impact signal integrity. My knowledge is not great but contact me directly if you want more.  Modeling software, of which that from Polar Instruments is widely used, may help quantify the signal degradation.

Louis Hart
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Thursday, September 17, 2015 12:26 PM
To: [log in to unmask]
Subject: [TN] PWB/PCB misregistration,

Fellow TechNetters:

   I have been asked to collect/gather information on this topic.   Therefore, today's topic of discussion is PWB/PCB misregistration, Internal/External.   How will this anomaly effect board performance?
What is the worst case scenario?   Is there a correlation between misregistration and exothermic event?

Impacts:
Signal Integrity   -
High Resistance path   -
Electrical spacing violation   -  IPC2221  Table 6-1,  Electrical Conductor Spacing
Hole breakout  -  IPC-2221   sec 9.1.2.1 & 9.1.2.2
Leakage path  -
Laminate Quality  -  CAF  -  Dry bundle - Non wet SHORT!  -

Victor,


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