Re: [SI-LIST] : SI Software for EMC

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From: Doug McKean (dmckean@corp.auspex.com)
Date: Fri Mar 17 2000 - 15:41:05 PST


Personally, I would jump at the chance of owning
emc software that could accurately predict results
in the far field at 10 meters less than 5 dB of
actual results. But I did some extensive testing
and measurements trying to correlate near field
results to the far field. They didn't exist.

I completely profiled a board with a near field
E-probe. Profiled the shielding effectiveness of
the enclosure. Did predictions. Didn't exist on
several products - high freq CATV shelves copper
and fiber at another company. So I'm skeptical
of any software that can claim accurate predictions
in the far field.

Besides, a product, as far as I'm concerned, is
simply a complicated array of many different types
of antennas composed of electric and magnetic dipoles,
slots, corner reflectors ... Good prediction
would be difficult at best.

Regards, Doug McKean

WOODS@sensormatic.com wrote:
>
> I have reviewed the archives but was unable to find answers to my questions.
>
> Our systems have digital PCBs with clock frequencies in the order of 30-60
> MHz and the systems have to comply with CISPR 22 Class B requirements. We
> currently perform design reviews on the schematics prior to layout and
> suggest standard mitigation techniques espoused by the major books on the
> subject. In order to improve our designs and hopefully reduce the number of
> layout passes caused by radiated emissions, we are considering adding a
> SI/EMC analysis module to our PCB layout package. These are my questions.
>
> 1) Does the software work as advertised? (the good ones, not the cheap ones)
> 2) Considering the expense, is it worth it?
>
> Richard Woods
>
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