[SI-LIST] Criteria for ferrite beads [was Re: anlog and digital power plane isolation with ferrite bead good idea?]
- From: "alfred1520list" <alfred1520list@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 4 Jan 2011 09:48:50 -0800
Dear List,
I simply want to express my appreciation for this exceptionally educational
list.
Dear Steve,
----- Original Message -----
From: "steve weir" <weirsi@xxxxxxxxxx>
Sent: Monday, January 03, 2011 1:07 PM
Subject: [SI-LIST] Re: anlog and digital power plane isolation with ferrite
bead good idea?
> The places where ferrite beads make sense are very distinct. Usually,
> no more than casual inspection of PDN requirements immediately indicate
> whether a ferrite bead based filter is worth considering.
For the benefit of the rest of us trying to get there, could you elaborate
on the second statement? Would that be looking at the difference
between the power spectral density of the supply noise and the maximum
tolerable noise power spectral density of the IC and say that there needs to
be X dB of attenuation and ferrite beads would provide Y dB which is
greater than X and so it is obvious?
If so, how to generate the two spectral plots if they are not readily
available?
Thank you very much for your time.
Best Regards,
Alfred Lee
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