[PCB_FORUM] Re: DGND/AGND merge point
- From: george.h.patrick@xxxxxxxxxxxxxx
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Thu, 21 Apr 2005 07:33:18 -0700
The NET_SHORT property mentioned by Vivekananda can be added to the pin of
the connector inside the schematic as well.
This will ensure connectivity without adding any dummy part.
--
George Patrick
Tektronix, Inc.
Central Engineering, PCB Design Group
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
Phone: 503-627-5272 Fax: 503-627-5587 <http://www.tektronix.com/>
http://www.tektronix.com <http://www.pcb-designer.com/>
http://www.pcb-designer.com
It's my opinion, not Tektronix'
-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Vivekananda R K -
CTD, Chennai
Sent: Thursday, April 21, 2005 04:02
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: DGND/AGND merge point
Hi William,
I can understand your problem.I can suggest one more way to short agnd,dgnd
.
1.Create PTH oblong shape(based your required length and width)
2.Create the pin as a .dra file.
3.Place that pin(Note:Very important that this pin should come through the
Netlist and as a component you can assign net name as agnd or dgnd) between
agnd,dgnd split point.(once it is placed the tool will take the clearance
between pin to shape)
4.Edit /Property of the pin only
5.Select "Net_short"
6.Add the net names agnd(if the pin net name in the netlist is assigned
dgnd) or (the pin net name in the netlist is dgnd than assign in the net
short property agnd)
This will avoid the drc .
If any doubt pls mail me.
Regards
Vivek
Pcb Designer
HCL Technologies
Chennai
-----Original Message-----
From: William Billereau [mailto:william.billereau@xxxxxxx]
Sent: Thursday, April 21, 2005 4:02 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: DGND/AGND merge point
Thanks for this tips, but it is a workaround.
It avoids DRC but not future errors as it is not electrically controlled.
In fact I forgot to tell that we used to do such methods but it can later on
a new revision generate a short-circuit or something like.
So we think it is not secure.. And then we would need something safer, if
possible....
William
----- Original Message -----
From: Vivekananda R K - CTD, Chennai <mailto:vivekanandark@xxxxxxxxxxx>
To: icu-pcb-forum@xxxxxxxxxxxxx <mailto:icu-pcb-forum@xxxxxxxxxxxxx>
Sent: Thursday, April 21, 2005 12:22 PM
Subject: [PCB_FORUM] Re: DGND/AGND merge point
Hi William,
In allegro menu
1.Setup/Subclass/Board geometry/
Create a layer called "GND_SHORT"
2.Add/line
under Board geometry/Gnd_short layer(Here you need to add a line width of 50
mil with required length where the agnd and dgnd gnds generating point)
3.In the manufacturing /artwork/Film Control
select your gnd layer.art (plane layer)film and add the subclass layer
"gnd_short" under the class board geometry(Set it in the Gerber level)
I hope this may help without generating DRC.
Regards
K.Vivek
Pcb Designer
Hcl Technologies
Chennai.
India.
-----Original Message-----
From: William Billereau [mailto:william.billereau@xxxxxxx]
Sent: Thursday, April 21, 2005 2:03 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] DGND/AGND merge point
Hello All.
Quite often, a board contains both AGND and DGND and the customer asks us to
connect them together on a single point on the board, like GND pin of a
connector.
Does anybody know how to do it in Allegro without generating DRCs errors?
Thanks in advance.
William.
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