[SI-LIST] Re: Basic question on power plane capacitance
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Mikhail Matusov <matusov@xxxxxxxxxxxx>
- Date: Thu, 09 Sep 2010 11:21:10 -0700
Assuming that you are measuring while the board is unpowered and
unpopulated, the variables are the actual thickness, and composition of
the dielectric layer. If you have some IC attached to the polygon all
bets are off.
Steve.
Mikhail Matusov wrote:
> Hi all,
>
> I have a small polygon in a plane layer of a multi-layer PCB. There is a
> solid ground plane underneath it and the top signal layer above. I have
> calculated from the basic plane capacitance equation that the plane
> capacitance for this polygon should be in the range of 420 pF. However, I am
> measuring 890 pF with one meter and 1 nF with another. I was wondering what
> am I doing wrong?
>
>
> Thanks,
> /Mikhail
>
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Steve Weir
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