[SI-LIST] Re: SPAM: Score 3.9: Re: HSPICE and Via Modeling

Thanks to everyone for the replies.  I was mostly
looking at extracting the capacitance and it may
be the best thing to just do the math, though I
have not seen too much in the way of formulae for
capacitance of a via shaft penetrating a plane.

Perhaps a good Physics book should be on the
shopping list.

Thanks Everyone!

dav0
David Lieby
Siemens Medical Solutions, Ultrasound Division, MVIS-S


?? wrote:
> Hi,David
> I think you don't need to consider the via impact under such low frequency.
> 
> 
>  > I have an engineer who wants a detailed model of a via.
>  > Mostly he is looking for capacitance. The part of the
>  > system he is working on runs at less than 5 MHz. The
>  > via is blind, with the closed end of the via ending
>  > fairly close to a ground plane.
>  >
>  >
>  >
>  > __ __ Top Pad
>  > ________ ][ _____ Reference layer
>  > ][
>  > ---------][----- routing layer 1
>  > ---------][----- routing layer 2
>  > ________ ][ _____ Reference layer
>  > ][
>  > ---------][----- routing layer 3
>  > ---------][----- routing layer 4
>  > ________ ][ _____ Reference layer
>  > ][
>  > ---------][----- routing layer 5
>  > ---------][----- routing layer 6
>  > __][__ Bottom pad, end of via
>  > _________________ Reference layer, at center of stackup
>  >
>  > the same stackup reversed.
>  >
>  > My questions:
>  > 1. Can one analyze this in HSPICE?
>  > 2. Does anyone have a spice deck with anywhere near
>  > a starting point, that they can share.
>  >
>  > The vendor support engineer could not come up with
>  > anything helpful.
>  >
>  > Thanks,
>  > dav0
>  > David Lieby
>  > Siemens Medical, USD, MVIS-S
>  >
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