Hi Neven,
How did you determine that is the *part* and not the pwb that’s causing the problem? Best Regards Charles Grasso Compliance Engineer Echostar Communications Corp. Tel: 303-706-5467 Fax: 303-799-6222 Cell: 303-204-2974 Pager/Short Message: [email protected] <BLOCKED::mailto:[email protected]> Email: [email protected] _____ From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, February 09, 2007 2:20 PM To: [email protected] Subject: Best SDRAM for Low-Emission? Hello everyone, I have a 2-layer PCB design, plastic enclosure, using 120 MHz SDRAM, two stuffing options: 2MB (16 Mb) in 50-pin tsop package or 8MB (64 Mb) in 52-pin tsop. It is slightly above class B radiated emission at the multiples of 120 MHz. I troubleshot it and I determined the SDRAM is the only source of the failing frequencies, everything else is quiet. I wonder if anyone has looked in how various manufacturers' memory chips perform emission-wise, particularly the type that I am using. I hope to find a manufacturer who makes "quieter" modules, so I do not need to change anything else on my board. If anyone has done such a comparison/investigation, I would appreciate if you would be willing to share, on-line or off-line, the results - which memory/manufacturer works best EMI-wise in such conditions. Regards, Neven ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
