[SI-LIST] Basic question on power plane capacitance

From: "Mikhail Matusov" <matusov@xxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Date: Thu, 9 Sep 2010 13:50:59 -0400

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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[SI-LIST] Basic question on power plane capacitance

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