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Re: gEDA-user: gschem: directly connecting two nets?

On Mon, 2011-01-24 at 07:48 -0800, Ouabache Designworks wrote:
> The special symbols is supposed to fuse netnames as issued on the
>    netlist,
>    not labels on the schematic.
>    -------------------------------------------
>    If you are also fusing the copper on the board then I would kind of
>    like to see that when I am viewing the schematic.
>    You want to give the user a choice. If I pull up a component view then
>    I want to see the signal names from the original designer. If I am
>    traversing a hierarchy and open an instance view then I want to see the
>    signal names that match the names in the parent instance.
>    John Eaton

For a loop antenna, for example, the solution needs to be in PCB.. allow
footprints / "functional groups" which implement RF components by
placing copper on some layer.

For me, this raises a very interesting design question:

How do I go from abstract inductor / transmission line / (capacitance
even?) representations on a schematic, to correctly DRC'd board layout?

The inductor will end up as a shaped piece of copper tracking, and at
this point, you realise that "net" is a very DC term!

We would need to have some way to demarcate the start and end of the
inductor in PCB, or to draw it on a layer, or with an attribute which
causes the copper making up the "component" to be disjoint from either
net connecting to that section. That piece of board layout becomes a
"component", not an interconnect between components.

One might imagine a similar method being useful to join two
hierarchically shorted nets together... have a "link" component which
joins AGND and DGND, which is implemented by copper drawn on the board
between those two power planes.

This would then allow preservation of important DRC checks such as
making sure the correct plane / return path is used for signals.


Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,

Tel: +44 (0)7729 980173 - (No signal in the lab!)
Tel: +44 (0)1223 748328 - (Shared lab phone, ask for me)

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