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January 1999

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Subject:
Re: Z-control
From:
"Leslie O. Connally" <[log in to unmask]>
Reply To:
Leslie O. Connally
Date:
Wed, 6 Jan 1999 10:54:24 -0600
Content-Type:
text/plain
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text/plain (50 lines) 
Hi Dave,

        Normally this would fall into the classification of a dual stripline,
but if he/she is only interested in impedance between the Plane and the one
signal layer, I don't see why this would not be valid. I believe I would handle
it as an unbalanced stripline and just Ignore the other signal layer.

Regards,
Les
>  From: David Curtis <[log in to unmask]>, on 1/6/99 11:31 AM:
>  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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