[SI-LIST] Re: Thesis (Eliminating package resonances due to standing waves)
- From: "Ray Anderson" <ray.anderson@xxxxxxxxxx>
- To: <Charles.Grasso@xxxxxxxxxxxx>, <vijayis@xxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 27 Jun 2005 10:18:57 -0700
And a 3rd question: IF the 'screen' isn't at RF ground, might it not
have some interesting resonances of it's own at frequencies removed from
the plane resonance frequencies where it might radiate?
-Ray
Raymond Anderson
Senior Signal Integrity Staff Engineer
Product Technology Department
Advanced Package R&D
Xilinx Inc.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Grasso, Charles
Sent: Monday, June 27, 2005 10:08 AM
To: 'vijayis@xxxxxxxx'; 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] Re: Thesis (Eliminating package resonances due to
standing waves)
Congratulations on a nice presentation.=20
First a question: As I understand it, your technique
is to add a 40mils thick piece of copper in a "screen"
inbetween the planes.?
OK a second question (!) - I assume that the screen is NOT
connected to either of the planes.?
Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx; =20
Email Alternate: chasgrasso@xxxxxxxx
=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On
Behalf Of Vijay B
Sent: Friday, June 24, 2005 5:15 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Thesis (Eliminating package resonances due to
standing
waves)
Hello,
I recently graduated with an M.S in EE from State University of New
York at
Binghamton. My thesis was in eliminating package resonances due to
standing
waves formed due to propagation and reflection of radial waves in
between
power and ground planes. I would like to share the presentation with the
list.
We incorporated a metal screen in between the power
and
ground planes of a board to act as a distributed capacitor arrangement.
We
used Speed2000 to model the setup and we confirmed simulations with
measurements on a hardware model using a vector network analyzer. We
concluded that with this approach we can eliminate all resonances due to
standing waves upto 10 GHz (may be even higher) on a 4"X5" board by
incorporating a screen of appropouriate dimension and a dielectric with
low
dielectric constant. If anyone is interested in the topic please go to
http://bingweb.binghamton.edu/~bj95053/ and open the file "Thesis
Presentation". It is a power point file. If you have any questions or
comments on this I would be happy to hear from you.
Thanks.
Regards,
Vijay
--=20
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