[SI-LIST] Re: Criteria for ferrite beads [was Re: anlog and digital power plane isolation with ferrite bead good idea?]
- From: Alfred Lee <alfred1520list@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Tue, 04 Jan 2011 23:21:58 -0800
Hi Steve,
Understood. Not a problem. Can you share the title so I can be on the look
out? Thanks.
Regards,
Alfred
"steve weir" <weirsi@xxxxxxxxxx> wrote:
>Alfred, it is not that I want to be a tease, but the second point is
>addressed in my DesignCon paper, which I am obligated not to preempt
>before it is presented next month. But you are following the right
>train of reasoning.
>
>Steve.
>
>alfred1520list wrote:
>> 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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>
>
>--
>Steve Weir
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