Re: [SI-LIST] : Measuring parasitic values

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Wed Sep 20 2000 - 10:07:35 PDT


I think, a possible solution is to manufacture a board with your stackup and all separate via sizes, that could be used; take a good capacitance meter and measure the hell out of bastards.

Anyway, a via capacitance is 1-1.5pF for regular ones on hi-speed boards; possibly smaller for blind/buried.

Also, a via, for all purposes, is not necessarily bad as a discontinuity. If it connects, say a pair of layers, that are fasr from each other, the via inductance will counteract its capacitance and the discontinuity will be
minimal.

Barry Ma wrote:

> Hi,
>
> We've seen lot of valuable discussions on how to calculate parasitic value of vias. Is there an efficient way to measure parasitic value of a via, or more generally other discontinuity in transmission line? -BM
>
>
> Thanks.
> Best Regards,
> Barry Ma <bma@anritsu.com>
> ANRITSU www.anritsu.com
> Morgan Hill, CA 95037
> Tel. 408-778-2000 x 4465
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