Breaking News
Power Tips

Power Tip 69: A Simple Oversight Can Ruin EMI Performance

View Comments: Threaded | Newest First | Oldest First
dvandit
User Rank
Manager
Adding primary filters
dvandit   3/12/2014 5:24:05 PM
NO RATINGS
I wonder how many designs had a primary filter added and subseqently passed EMI only because components had to be moved to make room for the filter...

GBrandly
User Rank
Rookie
Re: Adding primary filters
GBrandly   6/26/2014 2:51:47 PM
NO RATINGS
@dvandit: That was exactly the first thought that came to my mine when I read this. In this case I'd say the ends could well justify the means.  :)

Thinking_J
User Rank
Rookie
good observations... but...
Thinking_J   3/12/2014 7:13:48 PM
NO RATINGS
Looks like the second (improved) layout made space for additional magnetics (L100) .. but wasn't installed (instead a 100 ohm and a smt inductor/ ferrite bead was installed)

So the design is no longer the same size... (?) a compromise that many of us cannot obtain when faced with these problems...that helped get that 3x spacing improvement.

 

 

Sheetal.Pandey
User Rank
Manager
Re: good observations... but...
Sheetal.Pandey   3/13/2014 11:47:56 AM
NO RATINGS
Design review for EMI is a good to step to have in these complex designs. Yes the PCB layout makes lot of difference. Thanks to advancement in EDA tools, you can do a trial run on the layout before releasing the gerbers for PCB manufacturing.

August Cartoon Caption Winner!
August Cartoon Caption Winner!
"All the King's horses and all the KIng's men gave up on Humpty, so they handed the problem off to Engineering."
5 comments
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Flash Poll
Radio
LATEST ARCHIVED BROADCAST
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.