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I have designed and simulated a few circuits on Multisim. Usually, I order a PCB for the layout of each circuit independently. However, it is cost-effective to put multiple circuits on the same board (the cost of an additional circuit on the same board is less than the cost of a new board with the additional circuit).

How does one put together multiple independent layouts from different circuits on the same PCB in Ultiboard? Several issues arise if one simply draws all the circuits in one schematic and puts them together on the same board -- for example ground and power planes get shared, and I do not want this.

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  • \$\begingroup\$ Well, you could always define your own planes as ground and power \$\endgroup\$ – Daniel Oct 31 '15 at 1:49
  • \$\begingroup\$ Right, but then the plane defined as ground, for example, would fill up the entire board including regions of other circuits. \$\endgroup\$ – eqb Oct 31 '15 at 1:51
  • \$\begingroup\$ I mean define independent ground planes, i.e. ground0, ground1, ground2... \$\endgroup\$ – Daniel Oct 31 '15 at 1:55
  • \$\begingroup\$ But then you would need as many planes as grounds. My question is basically this exact issue - is there a way to isolate each circuit so that I can have one ground plane pour and then no copper and then another ground plane pour, and so on, all on the same plane? \$\endgroup\$ – eqb Oct 31 '15 at 2:26
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    \$\begingroup\$ A fundamental property of a net is that it expects all points on the net to connect to every other. If you don't want that, you should use separate nets, such as in this situation. Why is it so important to you they all be part of the same 'ground' net, even though they're physically disconnected? \$\endgroup\$ – Nick Johnson Oct 31 '15 at 10:07

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