[SI-LIST] Re: Traces don't cause EMI - really?
- From: "Anand Mohan Pappu" <amp46@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 13 Oct 2003 13:19:26 -0400 (EDT)
We were testing the Bit Error Rate of our optical receivers at ~2GHz and
every time the cell phone would ring, the Bit Error would just blow up.
This shows that Cell phone EM waves are interfereing with the traces.
(Since there is no other element which can interfere) And conversely, it
shows that traces do emit EM waves.
Anand
> Lee,
>
> I think you need to describe your measurement setup so that we clearly
> understand what you are talking about.
>
> For example, you need to describe the following:
>
> - transmission line type (microstrip, stripline, etc.)
> - transmission line geometry (trace length, trace width, height above
> plane, trace/plane thickness, etc.)
> - material parameters (substrate, conductors, etc)
> - frequency range of measurement
> - excitation source
> - transmission line termination conditions (both ends)
> - field probing technique (near-field? far-field? how was that
> measured?) - what you mean by "significant emissions"? - give a limit
> e.g. 20dB below FCC Class B)
>
> Regards.
>
> Hassan.
>
>
> Lee Ritchey wrote:
>
>>Brent,
>>
>>I've tried several times to measure significant emissions from a single
>> transmission line travelling over a plane at the distances above the
>> plane one uses to create signal paths for logic circuits, the topic of
>> concern in this thread, with no luck.
>>
>>I welcome measurements from others that supports the statement that
>> traces over planes are significant sources of EMI. So far, no one has
>> presented such evidence. Lacking such evidence, how can anyone make
>> such claims?
>>
>>
>>
>
>
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