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July 2003

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Subject:
Re: Impedance Calculations
From:
Thomas Beneken <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Wed, 9 Jul 2003 09:17:27 +0200
Content-Type:
text/plain
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Hello John,

the Signal Integrity List may be useful:
http://www.freelists.org/cgi-bin/webpage?webpage_id=si-list Subscription
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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