At 27/09/06 23:52, you wrote: > > Afaik, no. What's the use anyway? > > This would seem to serve no other purpose than to increase the > > impedance of the plane (larger holes = less copper) > > Leo > >I think you might have thing backwards, or, misunderstoo what I >really want to do.
You're right, I had it backwards. Silly me. I once had a design that relied on the top and bottom layers for its ground plane (it had vias every 150 mils), but after the first proto's were EMC tested I quickly added an internal ground plane and ended up with a six-layer board..... > For example: Okokok, I understand what you're trying to do. ;) >snippety-snip Just an observation: on my designs the measurements you gave are considered "humongous" ;) The only way I can think of to achieve what you want is making the via size equal to the hole size (with matching DRC rules of course) and manually put the required copper on the layers where needed, a sort of DIY padstack... This will probably result in a) the wanted result and b) a complete nightmare if you ever have to change the location of even one of those vias. Maybe the nightmare will revert to 'only' a bad dream if you create library parts that will do this, but it will remain troublesome. Blind vias are no option, I gather.... Good luck, 'for this is no easy task'. Good night even, I'm off to bed. Leo Potjewijd hardware designer Integrated Engineering Paasheuvelweg 20 NL-1105 BJ Amsterdam Zuidoost The Netherlands T: +31 20 4620713 F: +31 20 4620756 E: [EMAIL PROTECTED] I: www.smart-ID.com Integrated Engineering USA West coast PO Box 32 - Carmel Valley CA 93924 United States of America T: +1 831 659 3218 F: +1 831 659 1009 East Coast PO Box 151 490 Kinderhook Rd Columbia, PA 17512 T: (717) 666-1107 F: (717) 666-1116 This E-Mail message is intended only for the use of the individual or entity to which it is addressed and may contain information that is privileged, confidentional and exempt from disclosure. If the reader of this E-mail message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by telephone on +31 (0)20 4620 755. Thank you for your co-operation. ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
