Yes, what Earl Morse said is very important! Always keep in mind we have to carefully take care of BOTH signal trace and return path. If the reference plan is solid, the return path would automatically make it's way to form a least loop area with signal trace. (Why? least loop area -> least inductance -> least impedance in RF).
Barry Ma Anritsu [email protected] --------------- On Fri, 21 January 2000, "Morse, Earl" wrote: > The number one problem with PCB board routing that we encounter that can be > attributed to the layout personnel is: > > Routing high speed signal traces without regard for return current paths. > > Either the signals are routed across splits in the reference plane or the > signal switches layers and the new reference plane doesn't have a good path > to the old plane. Both problems result in higher emissions and poor signal > integrity. > > Earl Morse > Portable Division EMC Design > Compaq Computer Corporation > Phone: 281.927.3607 > Pager: 713.717.0824 > Fax: 281.927.3654 > Email: [email protected] <mailto:[email protected]> > > Emissions Control Laboratory > 10320 Rodgers Road, EC106 > Houston, TX 77070 > > > -----Original Message----- > From:[email protected] [mailto:[email protected]] > Sent:Friday, January 21, 2000 6:48 AM > To:[email protected] > 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 ______________________________________________________________ Free Internet Access from AltaVista: Get it, share it & win! http://freeaccess.altavista.com/pika/www/initweb.jsp --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
