Does anyone know the formula(s) for calculating the impedance of
differential pairs when the lines are on adjacent layers to one another
and NOT side by side on the same layer, or perhaps software that handles
this type of configuration? This does not appear to be covered in
IPC-D-275.

Thanks in advance for any enlightenment.

        Brock

+-----------------------------------+
| Brock Hunter     [log in to unmask] |
| Engineering Mgr.                  |
| Dynamic & Proto Circuits          |
| TEL (905) 643-9900                |
| FAX (905) 643-9437                |
| http://www.dapc.com               |
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