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Subject:
Re: [DES: Mixed dielectric controlled impedance]
From:
Andy Burkhardt <[log in to unmask]>
Date:
Thu, 19 Dec 1996 12:06:55 GMT
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>Hi Netters:
>
>The controlled impedance formulas in IPC-D-317A and IPC-2141, as well 
>as software packages we have, all assume a single dielectric material.  
>Anyone know formulas or software for mixed dielectric stripline impedance  
>prediction?  
>
>Sarah S. Bittner 
>[log in to unmask]
>Solliday Engineering 
>  
>
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>
Sarah,

There are some CAD software suppliers listed on page 36 of IPC-D-317A,
perhaps one of these can assist you.  Alternatively, I do remember a
paper presented at IPC Expo '94 by Abraham Ash, Altron, and Dick Eico &
Bob Evans, Berg Electronics, "A Systems Approach to Impedance Control",
P7-4.  I believe they were doing research on a software modelling program
that allowed for inclusion of different materials.  Perhaps you can
obtain a copy of this paper from IPC.

Hope this helps.



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