The PCB manufacurers here all seem to use a this or a subset of it from
POLAR instruments.

http://www.polarinstruments.com/products/stackup/SB8000.html
Jim Thornhill
University of Liverpool

----- Original Message -----
From: "Brooks,Bill" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, January 27, 2006 11:25 PM
Subject: [DC] Impedance/ Diff pairs/ layer stack up calculator?


> We want to evaluate the usefulness of a software tool for calculating
> differential pairs, and estimating stack up requirements for multi layer
> boards... Primarily to estimate the correct line width and spacing
> required
> in any given design stack up or material combination.
>
> Can any of you recommend a tool to do this sort of job that you find
> useful?
> I'd like to look at low, med and high end tools and characterize them
> based
> on price vs. performance and/or capabilities.
>
> Best regards,
>
> Bill Brooks - KG6VVP
> PCB Design Engineer, C.I.D.+, C.I.I.
>
> 3030 Enterprise Court, Vista, CA 92083
> http://www.dtwc.com <http://www.dtwc.com>
> Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
> e-mail:[log in to unmask]
> _______________________________________
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> Communications Officer, Web Manager
> http://dcchapters.ipc.org/SanDiego/ <http://dcchapters.ipc.org/SanDiego/>
> http://pcbwizards.com <http://pcbwizards.com>
>
>
>
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