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| From [log in to unmask] Mon Dec 23 12: |
04:31 1996 |
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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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