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Tell Me Again Ron – What’s This About CM & DM Radiation?

 

Apparently, I didn’t throw enough words at the CM/DM problem in the last several posts so I’m going to add to it, but from a slightly different perspective.  It’s either that or hide my email address.  I’ll do DM this time, CM next time.  We’ve been discussing loops all along.  If there’s current, there is a loop somewhere.  Finding it may be a … [Read more...]

EMC Engineers Come Bearing Gifts

 

It’s the holiday season again, when we celebrate the serious things in life and have some fun too.When EMC engineers come bearing gifts...tis NOT the season to be jolly.  Fa-la-la, le-la-la-laa.  In fact, it’s time to be worried. For to the EMC engineer, GIFTS is an acronym for: Grounding, Isolation, Filtering, Transient suppression, and Shielding. Sometimes it takes … [Read more...]

What Books are Recommended for EMC Design and Mitigation?

 

Editor’s note: This question was asked in response to Interference Technology’s recent webinar by Keith Armstrong. To view the webinar, click here. Question: What books do you recommend for EMC design and mitigation? Answer: Obviously, I’m going to recommend my own books (see below)! But in all seriousness I do think my books very good for the practicing electronic design … [Read more...]

CM Feeling Bad, Check its Pulse

 

The last post examined CM radiation.  Wow, what a problem!  Over 100,000 microvolts/meter from a 3.5 ma signal. If the DM is normally the intended signal, where does the big common mode signal come from?  Let’s take a look at that. The whole world seems to be enamored with high speeds.  I know I could hardly wait to get a 1 GHz notebook.  Did it help me … [Read more...]

What are the Slew Rates in Digital Circuits These Days and What Kinds of Frequency Spectra are Generated?

 

Editor's note: This question was asked in response to Interference Technology's recent webinar by Keith Armstrong. To view the webinar, click here. Question: What are the slew rates in digital circuits these days and what kinds of frequency spectra are generated? Answer: The slew rates of the digital signals generated by integrated circuits tend to increase as the silicon … [Read more...]

And The CM Currents Go Round and Round

 

When we were discussing green electron current (differential mode) in the last post, I mentioned that common mode (CM) currents (red electrons) are typically caused by unbalanced differential mode (DM) currents.  It’s pretty easy to visualize that in an unbalanced differential transmission system, one of the traces is longer, has an extra via, needs a branch, the spacing … [Read more...]

Pulse Generator for Automotive EMC Test Systems

 

Teseq Inc., a developer of instrumentation and systems for EMC emission and immunity testing, has released the FT 5531 pulse generator for automotive EMC test systems. According to the company, the FT 5531 is an upgraded version of the TF5530 that offers improved accuracy and supports classic and modern testing standards. The FT5531 pulse generator features a 150 ns pulse … [Read more...]

Integrated EW Defense System Completes EMC Testing for Pakistan FMS Program

 

The Advanced Integrated Defensive Electronic Warfare Suite (AIDEWS) developed by defense contractor ITT Exelis has completed electromagnetic compatibility testing at Edwards Air Force Base in California. The company is contracted to produce more than 160 AIDEWS systems for six nations as part of the F-16 Foreign Military Sales program; the EMC testing at Edwards Air Force Base … [Read more...]

Basics on Designing for EMC Compliance

 

Paul Lee Director of Business Development Murata Power Solutions, Milton Keynes, UK Electromagnetic interference (EMI) is the bane of many an engineer and of designs that must adhere to international and national regulations regarding electromagnetic compatibility (EMC). However, there are numerous techniques that can be applied to reduce both the emissions from and … [Read more...]

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