[SI-LIST] Re: How to measure voltage drop on plane
- From: steve weir <weirsp@xxxxxxxxxx>
- To: boris.traa@xxxxxxxxxxx, jmfisher@xxxxxxxxx
- Date: Fri, 23 Jul 2004 02:23:12 -0700
Boris, while I agree that there will be many peaks and nulls for travelling
and standing waves on a plane, I disagree that large voltages can appear
across very short distances on a plane and the plane still function
usefully for low voltage circuits.
Steve
At 10:26 AM 7/23/2004 +0200, boris.traa@xxxxxxxxxxx wrote:
>Can somebody tell me for what reason you would like to know the voltage
>drop on a ground plane. If this voltage could be measured it doesn't say
>anything on what probably would appear at some inputs connected to this
>plane nor does it say anything on what it means for EMI. The local fields
>will mainly determine these voltage levels and emission level. Measuring
>voltage drop between 2 positions (e.g. A and B) on a wire or plane will
>result in arbitrary values: 0 V is possible with a large distance between
>A and B as well as a high value when the distance is zero. It becomes more
>complicated when current distribution is not homegeneous anymore and
>wavelengths are comparble to or smaller than the conductor dimensions.
>In my opinion the transfer impedance of a connection for signal transfer
>is more important: the lower this impedance the lower the induced voltage
>in the ground conductor.
>Kind regards
>Boris Traa
>
>System design engineer EMC
>
>PDSL/EMC3
>Building WDV, room 1.01
>Prof Holstlaan 4
>5656AA Eindhoven, The Netherlands
>Tel: ++ 31 40 27 43766
>Fax: ++ 31 40 27 42224
>E-mail: boris.traa@xxxxxxxxxxxx Seri: btraa@nlsce1
>
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