Subject: RE: [SI-LIST] : Split Plane To: si-l...@silab.eng.sun.com From: Barry Ma <barry...@altavista.com> List-Post: emc-pstc@listserv.ieee.org Date: 24 May 2000 10:51:29 PDT
Another reason, I guess, is that you are not confident to use pwr planes as signal return planes. You said: "We pulled out all the stops to ensure every signal layer is referenced to a ground plane, rather than a power plane, which I understand should give better EMC performance." I'd like to say it again, it's OK to use pwr planes if you have enough interplane capacitance. Regards, Barry Ma b...@anritsu.com ------------ On Wed, 24 May 2000, "Brad Crowell" wrote: Christoph I agree with your suggestion and we did consider this but the additional cost was the overriding factor. Brad -----Original Message----- From: owner-si-l...@silab.eng.sun.com Sent: Wednesday, May 24, 2000 10:29 AM To: si-l...@silab.eng.sun.com Subject: RE: [SI-LIST] : Split Plane Brad, Did you think about doing this job using MicroVia technology? In this case you would be able to cover the top and bottom layer with ground, as the Fanout-Vias are in the pad. So the top and bottom ground plane will be real planes over the whole board! Then the stackup could look like this: GND Signal Signal 3.3V GND Signal Signal GND 5V Signal Signal GND Because of the MicroVias, you will be able to route much more effective, as they don't block other layers - perhaps you can even save one or two signal layers. If you are looking for good EMI performance, this would be a good idea. Christoph Hillen Utimaco Safeware AG Germany _______________________________________________________________________ Why pay when you don't have to? Get AltaVista Free Internet Access now! http://jump.altavista.com/freeaccess4.go _______________________________________________________________________ ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
