FreeLists / si-list / [SI-LIST] Re: Plated through hole capacitance

["Scott McMorrow" <scott@xxxxxxxxxxxxx>]

Kevin,

How you model this PTH is dependent upon your application, the edgerate, 
and the frequency of operation.  Capacitance may or may not be enough. 
 But, if you want to know what the capacitance of the PTH is, then the 
best bet is to use a 3D field solver such as Ansoft 3D or MIT Fastcap. 
(Fastcap is a bit crude to use, but it is free.  You'll find it at 
 http://www.fastfieldsolvers.com/) If you're dealing with signals faster 
than 1 Gbps, then modeling capacitance alone is probably not enough. 
 For more accurate modeling, I would suggest fullwave field solver such 
as CST Microwave, Ansoft HFSS, or one of the many other good microwave 
tools that is available.  These will produce Touchstone S-parameter 
files that can then be processed in a myriad of ways in simulators and 
translation software in either the frequency or time domain.

regards,

scott


Fitzgerald, Kevin wrote:

>Hi,
>
>I am trying to find the best way to estimate the capacitance of a plated
>thru hole which is being used for press fit connectors.
>
>The hole has a diamter of 0.040 inch and the pad is 0.065 inch and the
>keepout has a diameter of 0.085inch.  The board will be about 0.200 nich
>thick
>
>thanks
>
>Kevin Fitzgerald
>
>Jr Hardware Engineer 
>General Dynamics Canada
>(613) 596-7776
>kevin.fitzgerald@xxxxxxxxxxxx
>
>
>
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-- 
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com




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