[SI-LIST] Re: [!! SPAM] Re: 6 layers stackup
- From: "Joel Brown" <joel@xxxxxxxxxx>
- To: "'steve weir'" <weirsi@xxxxxxxxxx>
- Date: Tue, 26 Feb 2008 15:23:44 -0800
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
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