On Thu, 2011-01-27 at 08:32 +1100, Stephen Ecob wrote: > > Perhaps I was going a bit far to suggest full DRC for the actual antenna > > design. What I really meant was not loosing information for net > > connectivity checking leading up the antenna. > > Thinking longer term, why not support DRC checking of inductance and > resistance for specially tagged traces ? > Of course most nets can simply be thought of as perfect conductors, > but if we introduce the concept of a resistive and/or inductive trace > it would be very helpful for making small inductors and resistors > directly out of copper. > My current design implements resistors of 2.5mOhms up to 0.25 ohms > purely with copper. PCB's DRC doesn't understand and highlights these > resistors in orange, but I can imagine a future PCB where I specified > that a particular trace should have a resistance of (say) 10 mOhm and > DRC would handle it gracefully. That is exactly the sort of use-case for this feature I was looking for. A similar "track is component" scenario: PCB fuse track - a dirty trick I've seen in some Honywell boiler controllers.. where a deliberately thin trace is used to act as a fuse. Other cases which require net tagging: Computing current density for thermal reasons for a PCB trace. -- Peter Clifton Electrical Engineering Division, Engineering Department, University of Cambridge, 9, JJ Thomson Avenue, Cambridge CB3 0FA 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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