[SI-LIST] Re: CPW
- From: "Chris Reid" <chris.reid@xxxxxxxxxxxxxxx>
- To: <xileil@xxxxxxxxxxx>, <sunil_bharadwaz@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 15 Jun 2006 16:23:11 -0700
Every piece of metal "near" the trace of interest changes its impedance.
Christopher E. Reid
Chief Scientist and Founder
Pressando SI
9315 SW Lake Street
Tigard, OR 97223-6034
503-869-6703 (cell)
503-624-8159 (home)
----- Original Message -----
From: "Xilei Liu" <xileil@xxxxxxxxxxx>
To: <sunil_bharadwaz@xxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
Sent: Thursday, June 15, 2006 3:11 PM
Subject: [SI-LIST] Re: CPW
> 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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