[SI-LIST] Re: Via modeling & de-embedding
- From: "Hassan O. Ali" <hassan@xxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 16 Jul 2004 12:57:28 -0400 (EDT)
Hi Jason,
Good point! Different line segment lengths give rise to different S21. However,
it's
fairly easy to determine if the change in S21 is due to via proximity effects
or line
segment length change. You can actually pre-compute S21 for just your line and
determine
insertion loss per unit length. You can then factor that in your convergence
calculations.
Hassan.
On Jul 16, "pritchard, jason" <pritchard_jason@xxxxxxx> wrote:
>
> Hi Hassan,
>
> I just want to clarify your statements about S21 convergence.
>
> If you modify the length of the t-line feeding the via, S21 should maintain
> the same value if the length of the feeding transmission line is
> sufficiently long enough to isolate it from the via effects? So if you
> modify the transmission line lengths and it does change from simulation to
> simulation then you are to close to the via?
>
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