[SI-LIST] Re: [!! SPAM] Re: 6 layers stackup
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: Joel Brown <joel@xxxxxxxxxx>
- Date: Tue, 26 Feb 2008 18:59:05 -0500
Correct.
You could use the annular ring resistor method that Istvan patented
US Patent 6727780
http://www.google.com/patents?id=KsoRAAAAEBAJ&printsec=abstract&zoom=4&dq=6727780
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax
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Teraspeed® is the registered service mark of
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Joel Brown wrote:
> So it has been shown by some smart engineers that there is a benefit, but it
> cannot be realized because no such part is available. I also wonder if the
> added inductance of a discrete series 0402 resistor makes that option not
> viable.
>
> Joel
>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of steve weir
> Sent: Tuesday, February 26, 2008 2:57 PM
> To: Joel Brown
> Cc: leeritchey@xxxxxxxxxxxxx; 'Scott McMorrow'; 'QU Perry';
> si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: [!! SPAM] Re: 6 layers stackup
>
> Joel, controlled / high ESR caps are rare birds. Istvan has been
> championing them for years nd some parts have been made. If you are
> prepared to buy 100,000,000 at a shot you might get somewhere w/ the
> manufacturers. But right now, most are running their lines to capacity w/
> commodity parts.
>
> Regards,
>
>
> Steve.
> Joel Brown wrote:
>
>> While we are all talking about bypass caps, I just got done reading a
>> book by Bruce Archambeault called "PCB Design for Real-World EMI
>> Control". In the book there is a chapter on bypassing and it shows
>> measurements from actual test boards. In one case, a certain percentage of
>>
> the caps are "high ESR"
>
>> which seems to result in substantial damping (reduction) of the
>>
> resonances.
>
>> The high ESR caps are described as ceramic capacitors with a series
>> resistor built into the package, I have been unable to find such a
>> part. Has anybody found a benefit to this approach and a source for high
>>
> ESR capacitors?
>
>> Thanks - Joel
>>
>>
>>
>>
>>
>>
>
>
> --
> Steve Weir
> Teraspeed Consulting Group LLC
> 121 North River Drive
> Narragansett, RI 02882
>
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