[SI-LIST] Re: SPLIT PLANE GAP
- From: "Doug McKean" <dmckean@xxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 29 Oct 2001 14:34:17 -0800
In my opinion and with regard to signal integrity,
25mil to 100 mil split widths are relatively small
when compared to the wavelengths involved.
With regard to EMI, splits (or better slots) are
the electrical dual to a wire antenna. Where
current makes a wire antenna work, a voltage
potential makes the slot work as an antenna.
This would be accomplished with the return
current following the trace to the point of the
split, then attempting to go around it.
I've seen some bench measurements that show
the greatest point of radiation is at the furthest
ends of split where the current abruptly changes
directions, i.e. the point of greatest acceleration
of charge.
This is one of couple of instances where one
can have perfectly acceptable signal integrity
but bad EMI.
Regards, Doug McKean
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