[PCB_FORUM] Re: Dual Plane VIA Connection Question
- From: "Vince Di Lello" <vince.dilello@xxxxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Sat, 11 Mar 2006 15:29:58 -0800
Gerry, while that is a great idea, and one that I may be forced to use, I am
hoping to find a solution that is 100% fool-proof should another designer pick
up the design. What if those via's are moved and the voids were not turned on
at the time of the move and the new designer does not check for that situation.
You now end up with those vias connected to the plane again. See my point?
Vincent Di Lello, CID+
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx on behalf of Gerry Meier
Sent: Sat 3/11/2006 2:44 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Dual Plane VIA Connection Question
Vince,
Why don't you put a void on the internal 3.3V plane around the lower vias?
Gerry Meier
Sr. PCB Designer
Freedom CAD Services, Inc.
Voice: (603) 864-1300 x1350
AL Voice: (256) 417-6944
Email: gerry.meier@xxxxxxxxxxxxxx
Visit us at www.freedomcad.com <http://www.freedomcad.com/>
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Vince Di Lello
Sent: Saturday, March 11, 2006 4:27 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Dual Plane VIA Connection Question
Here's hoping one of you great designers out there (and Allegro expert) can
help me out ... in the picture below you will see a light blue external (Top
Side) 3.3V plane. Inside this board (but not shown) is a separate 3.3V plane.
What I would like to do is have the (3) vias at the top of the picture (coming
off the electrolytic cap) make connection with the internal 3.3V plane and then
connect to the electrolytic cap with traces as shown in the picture. The 3.3V
then travels down this small external plane coming into contact with some other
capacitors and ultimately ends at the two vias at the bottom which carry the
current from the top side of the board to the bottom side of the board where in
turn there are two traces that connect to two bottom side pads of a bottom side
connector. Now for my problem - the two vias at the bottom of the light blue
area are now also connected to the INTERNAL 3.3V master plane (for clarity sake
I did not turn that plane on). I DO NOT WANT them to connect to the internal
3.3V plane. I want to force the 3.3V signal to have to travel through the caps
and then into the connector pads on the external layer only. Is there a setting
or a property that I can add to those two vias so that they get connected to
the small external 3.3V copper plane, but NOT to the INTERNAL 3.3V master plane?
Any help, especially on a weekend, would be greatly appreciated. Thanks in
advance and I hope all who are listening will have a great weekend - at least
what is remaining of it. Thanks again.
Vincent Di Lello, CID+
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