Hi All, My Technical Tidbit this month discusses another effect of allowing signals to cross plane breaks on printed wiring boards, generation of common mode currents that cause emissions problems.
Abstract: Signals that cross ground/power plane breaks on printed wiring boards (PWBs) can cause common mode currents on system cables resulting in excessive EMI emissions in addition to any signal quality issues. Data is presented that shows significant emissions can result from a small 5 cm plane break, even at frequencies of only tens of megahertz. The link to the article is the picture of the experimental test setup at the bottom of the home page at http://emcesd.com . -- ___ _ Doug Smith \ / ) P.O. Box 1457 ========= Los Gatos, CA 95031-1457 _ / \ / \ _ TEL/FAX: 408-356-4186/358-3799 / /\ \ ] / /\ \ Mobile: 408-858-4528 | q-----( ) | o | Email: [email protected] \ _ / ] \ _ / Web: http://www.dsmith.org 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/listserv/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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
