[SI-LIST] Re: CPW
- From: "Xilei Liu" <xileil@xxxxxxxxxxx>
- To: sunil_bharadwaz@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 15 Jun 2006 22:11:51 +0000
Sunil,
In my view, even the traces are routed on the inner Layers ,the ground
should still effect the impedance of the clock trace, as the impedance is
obtained from L, C which are related to the gap between the trace and the
ground, the dielectric constant(including both dielectric and air), trace
width etc.
Celine
>From: sunil bharadwaz <sunil_bharadwaz@xxxxxxxxx>
>Reply-To: sunil_bharadwaz@xxxxxxxxx
>To: si-list <si-list@xxxxxxxxxxxxx>
>Subject: [SI-LIST] CPW
>Date: Thu, 15 Jun 2006 12:04:49 -0700 (PDT)
>
>Hello All ,
>
> When a high freq clock trace is run on the Top Layer (Microstrip) , the
>impedance
> would change if ground gaurding is provided on either sides.This is
>because
> then impedance calculations would pertain to that of a Coplanar Wave
>Guide.
> The trace to copper clearance will set the impeadance along with the
>actual
> trace width,Dielectric constant & etc.
>
> I believe that for the clock traces routed on the inner Layers
>(Stripline) ,the
> ground gaurding does not effect the impedance of the clock trace.
>
> Pls correct me if this wrong.
>
> Thanks in Advance
>
> Regards
> Sunil
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