Most of the mistakes are by the design engineers and not the pcb designers. The mistakes are:
* Mixing of I/O devices with clocks, processors and similar noisy digital devices * Inadequate power/ground isolation of noisy digital devices * Inadequate I/O filtering * Failure to shunt ESD and EFT on I/O lines to chassis ground (not digital ground) * High impedance ground traces (too narrow and/or too long) * Connecting I/O shields to the pcb and not to the chassis * Inadequate physical isolation of power line filters from noisy circuits and traces Richard Woods ---------- From: rehel...@mmm.com [SMTP:rehel...@mmm.com] Sent: Friday, January 21, 2000 7:48 AM To: emc-p...@majordomo.ieee.org Subject: EMC Circuit Board Design Dear List-Members, I am requesting information/opinions/etc. on the following: When circuit boards are designed, what are the common mistakes that the circuit board designers make regarding EMC (multi-layer boards in particular)? You can respond to me directly but I would prefer a response to the list as I believe that the question is of interest to many on this list-server. In either event I will compile the responses and resend the compilation later. Thanks for your time, Bob Heller 3M Company --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).