[SI-LIST] Re: Impedance confusion
- From: steve weir <weirsi@xxxxxxxxxx>
- To: "Lakshmi N. Sundararajan - PTU" <lakshmi.s@xxxxxxxxxxx>
- Date: Fri, 21 Nov 2008 12:34:34 -0800
It depends on whether sigtop and sigbot are planes or not. If they are
both planes then it is an offset stripline.
Steve.
Lakshmi N. Sundararajan - PTU wrote:
> Hi Team,
>
> Between these two stackup,
> a) SIGTOP-PP(5 mils)-SIGINNER1-PP(22 mils)-SIGBOT
> b) SIGTOP-PP(22 mils)-SIGINNER2-PP(5 mils)-SIGBOT
>
> While computing the impedance of the SIGINNER* layer,
> it is offset stripline or edge coupled offset stripline.
>
> Would the impedance be different between these two cases?
> I ask this because, when board (a) is rotated it becomes
> board (b) and hence I do not expect impedance to vary between
> these two stackups.
>
> Can anyone please confirm/clarify on this.
>
> Thanks,
> -LN
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