Hello John,
the Signal Integrity List may be useful:
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http://groups.yahoo.com/group/si-list/messages Archives
Regards,
Thomas
-----Original Message-----
From: John Parsons [mailto:[log in to unmask]]
Sent: Tuesday, July 08, 2003 10:37 PM
Subject: FAB: Impedance Calculations
Greetings all,
I could use a little help here. I don't have an impedance solver at hand
and I have a customer looking for a suggested build for a 10 and 12 layer
board with signal traces running at 100ohm (single ended and differential).
They will have signal traces at 4-6mil's (I am using 5mil for my rough
calculations) but I can't see how to do this with regular FR-4 laminate (Er
4.2). Has anyone build/designed boards with this requirement? Can you give
me some clues as to lay-up or laminate spec's that could save me some leg
work?
Stack is as follows; 1/2oz base copper all layers
10 layer, Sig,Plane,Sig,Plane,Sig,Sig,Plane,Sig,Plane,Sig
12 layer, Sig,Plane,Sig,Sig,Plane,Sig,Sig,Plane,Sig,Sig,Plane,Sig
Regards
John Parsons
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