[SI-LIST] Re: Power and Ground Plane area

If you read a little further you should find that
there is a frequency dependency. Tom has pointed out
that for frequencies <1kHz current takes the path of
least resistance. For frequencies >10kHz current takes
the path of least reactance.

You will find this in is presentation on EMC Principles 
on the RMCEMC website. Go to http://www.ieee.org/rmcemc
and look for our October presentation.

Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel:  303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Email: charles.grasso@xxxxxxxxxxxx;  
Email Alternate: chasgrasso@xxxxxxxx
 


-----Original Message-----
From: Darshan Mehta [mailto:darshanmehta2k@xxxxxxxxx] 
Sent: Wednesday, December 01, 2004 8:01 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Power and Ground Plane area


Hello Everybody,

I was reading one of the IEEE paper on topic "EMC Analysis" by Dr. Tom Van.
He says that Return current takes the least impedance path. If the signal
speed is 1 KHz, there is no need of Power or Ground Plane because even if
you have Power Plane, the return current will not effectively utilize the
plane. So my question is, how we should decide at what signal speed we
should use Plane area for Power and Ground. Is there is any specific formula
for that. Thanks.

Best Regards


Darshan Mehta

 


                
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