On 12:20 PM 1/06/2001 +0100, Jason Morgan said:
>A DRC rule that allowed a short between two pads for a given footprint with
>a net
>class or default net name (a bit like no-net) called 'embedded component'
>would be a much better solution as its less open to human error. -
>Suggestion No2 for the day, (though not new as I expect this has been asked
>for many times in the past)
>
>J.
I have long suggested that the Short circuit rule - look on the "Other" tab
in the design rule box - should allow region and other more specific scopes
than it currently does - for just the sort of application being
discussed. RF strip lines, power supply star points etc. I think it is
great to bring it up again as I suspect there is some radar work going on
at Protel at the moment. Now if we can just get serious work done on new
features and extensions of existing features instead of ho-hum RFQ add-ons
......
As David Cary pointed out, the Lomax Virtual Short (tm) is a very handy
little trick that can do just this - basically think two pads with very
small clearance (say 0.01 mils) and a suitable clearance design rule
restricted to just those pads. Such a small gap will not get through the
various production processes. Since you can define very accurately were
the short should be, and you can add a comment to the design rule and you
can make it as a component with a suitable matching sch symbol - the whole
thing is very well documented and does not require any special action in
production - apart from warning your PCB maker that it/they exist and so
they do not get too worried when their CAM package warns of such minute
clearances.
Ian Wilson
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