FreeLists / si-list / [SI-LIST] Re: Oscillation killer

["Ray Anderson" <ray.anderson@xxxxxxxxxx>]

Roger-

Not being familiar with your application I can't say if this would be
appropriate or not, but have you looked at the Eccosorb materials from
Emerson & Cumming (http://www.eccosorb.com/catalog/eccosorb/index.asp)?
They have materials in both sheets and blocks as well as some liquid
moldable versions. Perhaps a drop of the moldable stuff might work.

These materials exhibit loss at microwave frequencies and are intended
to absorb unwanted energy.

All the above being said, it sounds like an absorber is kind of a
band-aid fix and finding and fixing the root cause would be the way to
go for a long term fix.

Regards,

-Ray

Raymond Anderson
Senior Signal Integrity Staff Engineer
Advanced Platforms Group
Advanced Products Division
Product Technology Department
Package Design Engineering
Xilinx Inc.
2100 Logic Drive
San Jose, California  95124
(408) 626-6277



-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Roger.Delbue@xxxxxxxxxx
Sent: Monday, March 05, 2007 9:50 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Oscillation killer


Hello All,

I am testing a new IC proto and found an oscillation at several tens of
GHz. After spending quite some time simulating the structures we were
able
to identify that the issue was related to coupling as well as the
termination of the line inside the IC. To demonstrate that it was true
we
put a drop of H2O on the area where we expected the problem to be and as
simulated the water stopped the oscillation. Of course that was true
until
the heat of the IC evaporated the water and oscillation restarted.

This work and we do not have to respin the IC yet but it is a PAIN!!!!

Does anybody knows a material that would work like water but it is more
permanent and does not degrade at temperature between 90 and 120 degC?

Thanks

Roger Delbue

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