RE: [SI-LIST] : DIFF PAIRS

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From: Larry Miller (ldmiller@nortelnetworks.com)
Date: Tue Jun 13 2000 - 07:13:34 PDT


If you were talking about stripline (traces between two planes I get the
same rough answer as the man from 3Com.

Sorry if I caused any confusion. I thought you were talking microstrip
(traces on on surface layer).

The calculator is still a good deal, though!

Larry Miller

> -----Original Message-----
> From: Sean Murray [SMTP:seandm@mmspec.com]
> Sent: Monday, June 12, 2000 1:35 PM
> To: 'si-list@silab.eng.sun.com'
> Subject: [SI-LIST] : DIFF PAIRS
>
> Anyone have any thought on what to use for the following numbers.
>
> Material: CE
> Impedance: ZO of the differential trace is 50Ohm and ZOD of each
> differential pair traces is 100Ohm.
>
> I built a board using 8 mill traces with a 8 gap between the pair, and
> .008 gap between plane to sig and then plane.
>
> Numbers were not what I expected, fabhouse used Polar+fudge factor to
> give me the numbers.
>
>
>
> Regards,
> Sean Murray
> General Manager
>
> M&M Specialties Inc.
> 1236 W. Southern Ave. #106
> Tempe, AZ. 85282-4518
> Phone: (480) 858-0393 x105
> Cell: (602) 684-7859
> Fax: (480) 858-1882
> Email: seandm@mmspec.com
> WWW.mmspec.com
>
>
>
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