[SI-LIST] Re: Why is shield grounding necessary for Inpair Skew (Intra pair skew)?
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 01 Aug 2013 20:57:01 -0700
In two words: unequal capacitance.
Steve.
On 8/1/2013 6:25 PM, Jus wrote:
> Hi, I am interested in in-pair skew. Hoping another expert could help! :)
> Does anyone know why grounding a differential pair shield (ex. twinaxial or
> twisted pair foil) is needed to generate high within-pair-skew (intra-pair
> skew)? For instance, with the pair's shield grounded the in-pair skew value
> may be 10 ps/ft, while it is only 2 ps/ft with shield ungrounded (shield left
> floating). Why does grounding the shield dramatically increase In-Pair Skew?
> Are there any cases where a differential pair's overall shield or individual
> shield should be left ungrounded when measuring in-pair skew? I think I know
> the answer, hoping for confirmation. Any assistance much appreciated!:)
>
> Jus
>
>
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