The "moldable stuff" has worked for a similar issue we had however only a temporary solution until we were able to fix the package I/O noise. -Jory Ray Anderson <ray.anderson@xxxxxxxxxx> wrote: 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 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: =20 //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu =20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu --------------------------------- Cheap Talk? Check out Yahoo! Messenger's low PC-to-Phone call rates. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu