[SI-LIST] Re: high ESR caps
- From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- To: "Tom Biggs" <tbiggs@xxxxxxxxxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 27 Feb 2008 09:45:25 -0700
For years EMI engineers have "sprinkled" decoupling caps
throughout a pwb (especially in blank areas) to dampen
resonances. A process also described by Howard Johnson.
Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Tom Biggs
Sent: Tuesday, February 26, 2008 6:45 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: high ESR caps
TDK just announced last week caps with settable ESR:
http://news.thomasnet.com/fullstory/540513
-tom=3D20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Ray Anderson
Sent: Tuesday, February 26, 2008 3:03 PM
To: si-list@xxxxxxxxxxxxx
Cc: Joel Brown; Ray Anderson
Subject: [SI-LIST] high ESR caps
Joel-
I've changed the title of this thread so as to not have it mixed in with
the other ongoing discussion.
Check out the following two papers (and perhaps several others) on
Istvan's web site that deal with the issue of controlled ESR decaps.
http://home.att.net/~istvan.novak/papers/EPEP2004_controlled-ESR.pdf
http://home.att.net/%7Einovak/papers/DCE07_TF-MP3_SUN.pdf
Ray Anderson
Xilinx Inc.
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Joel Brown
> Sent: Tuesday, February 26, 2008 2:04 PM
> To: 'steve weir'; leeritchey@xxxxxxxxxxxxx
> Cc: 'Scott McMorrow'; 'QU Perry'; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: [!! SPAM] Re: 6 layers stackup =3D3D20 While
we=3D20
>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 =3D20
>resonances.
> The high ESR caps are described as ceramic capacitors with a series
=3D20
>resistor built into the package, I have been unable to find such =
a=3D20
>part. Has anybody found a benefit to this approach and a source
for=3D20
>high ESR capacitors?
>=3D3D20
> Thanks - Joel
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