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Subject: Re: PCB routing
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Sun, 27 Oct 2002 07:11:14 GMT
NNTP-Posting-Date: Sun, 27 Oct 2002 08:11:14 MET
"Bevan Weiss" schrieb im Newsbeitrag
> It also gives you a semi-decent form of sheilding from RFI etc...
It seems the shielding is seldom understood...
The gnd-plane works so well because it minimizes the loop the current is
consider a data line where a current is flowing into the following device.
It will create an electric field.
Now what is usually not seen, the same current will have to flow back from
the following device into the sending one through the gnd or Vcc connection.
With a gnd and power plane, the returning current will flow exactly along
the projection of the data line to the corresponding plane, because the two
electric fields of the incoming and returned current cancel each other and
thus the inductivity of that line gets minimized.
This leads automatically to the minimal loop area with the least possible
electronic hardware designer
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