Bill; 

We've been looking at the Polar Instruments Si8000. My understanding is
that theirs is the "de-facto" standard in impedance calculations and
stack-up generation. This is definitely the "high-end" tool. 
Our interest has been prompted by the variety of results we have seen
from various 'free' calculators vs the results we get back from our
fabricators. We really want to develop a geometry, by design, that our
fabricators will agree with.

Denis Lefebvre, CID+
Sr. PCB Designer
Finisar Corp
(408) 542-3832


-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
Brooks,Bill
Sent: Friday, January 27, 2006 3:25 PM
To: [log in to unmask]
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]
_______________________________________
Member of the San Diego Chapter of the IPC Designers Council
Communications Officer, Web Manager http://dcchapters.ipc.org/SanDiego/
<http://dcchapters.ipc.org/SanDiego/>
http://pcbwizards.com <http://pcbwizards.com>



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