Dave,

A free evaluation copy of a Boundary Element Method field solving single ended
and differential impedance calculator can be downloaded from:

http://www.polar.co.uk

Hope this is helpful.

Best regards

Andy

At 04:42 PM 08/01/99 +0000, you wrote:
>David Curtis wrote:
>> Hi there,
>>
>> Can anyone comment on the validity of a stripline Zo calculation when
>> the layer in question resides between a plane and another signal layer
>> and then a plane, instead of between two planes?  The intent of the
>> designer was to ignore the adjacent signal layer. Fab guys: is this
>> acceptable when you have to meet a certain spec?
>>
>> Thanks,
>>
>> Dave
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>
>Hi Dave,
>
>   That configuration sounds a heck of a lot like me to a dual stripline
>which is a different calculation.
>
>   The additional signal layer will have an effect on the impedance of
>the desired signal layer. If the dielectrics between each circuit layer
>to ground are even you will definitely want to use a dual stripline
>calculation. If the dielectrics between each circuit layer to ground are
>not equal you will need to use an offset dual stripline calculation.
>
>                                                Regards,
>                                            David G. Pacheco
>
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