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dvandit
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Adding primary filters
dvandit   3/12/2014 5:24:05 PM
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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...

Thinking_J
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good observations... but...
Thinking_J   3/12/2014 7:13:48 PM
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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
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Re: good observations... but...
Sheetal.Pandey   3/13/2014 11:47:56 AM
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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.

GBrandly
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Re: Adding primary filters
GBrandly   6/26/2014 2:51:47 PM
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@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.  :)



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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