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

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From: Knighten, Jim L (JK100005@exchange.SanDiegoCA.NCR.COM)
Date: Thu Mar 16 2000 - 10:50:29 PST


Richard,

I speak as one who does not routinely use prepackaged EMC analysis tools -
perhaps I'm even biased against them. To the consternation of most of us, a
large fraction of the most common EMI problems relate to design details that
cannot be found on a schematic. So, modeling tools that simulate all the
signals often miss the most important things. There is a new class of tools
that is evolving that is based more on an expert system approach. These, at
least, have the potential of detecting these "off schematic" design details
that are so important to good EMI design. A potential weakness of these
tools is that their strength lies in the ability to learn - so you benefit
as you repeat similar designs. If you are always designing new stuff, then
maybe these tools are of lessor use to you.

Jim Knighten
________________________________________________________
Dr. Jim Knighten e-mail: jim.knighten@ncr.com
<jim.knighten@ncr.com>
Technical Consultant - Design
NCR
17095 Via del Campo
San Diego, CA 92127 http://www.ncr.com <http://www.ncr.com>
Tel: 858-485-2537
Fax: 858-485-3788

                -----Original Message-----
                From: WOODS@Sensormatic.com [mailto:WOODS@Sensormatic.com]
                Sent: Thursday, March 16, 2000 6:30 AM
                To: si-list@silab.eng.sun.com
                Subject: [SI-LIST] : SI Software for EMC

                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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