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Auto route

Discussion in 'CAD' started by Angelo Fraietta, Aug 4, 2003.

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  1. I am looking for an academic reference for the pro and cons of auto routing with
    a tool like Protel.

    Does anybody have any references that I might be able to use?
    Angelo Fraietta
    Home Page

    Note:Remove NoSPAM to email me
  2. David Harmon

    David Harmon Guest

    What are you trying to accomplish?
  3. The pros are a cheap auto-router may generate a board.. the cons are they
    may generate a board.

    I've been designing PCBs for over 10 years and the cheap ones are just that
    ... cheap unless you have a spear $100k then your better off setting the
    rules and routing it by hand... and even if you have $100k .. it'll still
    take you longer to setup the design rules than to hand route :)

    but that's my opinion.

    Sometimes you get lucky and the router will finish .. but I've hand cleaned
    a PCB in as much time as it took for me to route it by hand for the next

  4. I am writing a thesis and am justifying the use of auto routing in Protel

    I found one
    Feldmann, K., M. Koch, and A. Rothhaupt. "Intelligent Enhancements for
    Conventional Layout Systems to Support the Design of Printed Circuit Boards."
    Paper presented at "Low-Cost Manufacturing Technologies for Tomorrow's Global
    Economy," Proceedings 1994 IEMT Symposium., Sixteenth IEEE/CPMT International,
    12-14 September 1994 1994

    Angelo Fraietta
    Home Page

    Note:Remove NoSPAM to email me
  5. I found Protel 99SE was quite good. But then again, I don't have the experience
    of hand routing that you have.
    I sometimes had that problem.
    Angelo Fraietta
    Home Page

    Note:Remove NoSPAM to email me
  6. Hal Murray

    Hal Murray Guest

    I am writing a thesis and am justifying the use of auto routing in Protel

    Nothing to do with Protel, but in general...

    Look at the big picture. It's a cost/benefit issue.

    If the auto router works on your problem it will probably save you
    a lot of time.

    I expect that many large/complicated designs are mostly auto routed.
    I also expect that there is a lot of hand work in critical places.
    Most of the time the auto-router will do the right thing if the placement
    is good and the remaining choices are pretty simple. Often you can give
    it hints/constraints to help it do the right thing.

    The last board I did was tiny and simple. The auto router did it in
    a few seconds. I pushed some parts around to make the job simpler.
    The next try it got a better result. I'm sure I could have done
    a better job by hand, but it wasn't worth the time/effort.
  7. Guest

    Generally agree, though on boards containing many bussed components
    auto-routers often do a good job of laying in the endless parallel
    tracks and can save a lot of time here.

    Where auto-routing is always useful is in testing component layout.
    Run the autorouter (not necessarily until it has finished trying)
    and look at the failed routes. Congested area, mis-alignments,
    long traces on critical signals should all become apparent and
    suggest how the layout could be improved. A few times round this
    loop generally finds a better layout whether auto or manually
    routing the final PCB.
  8. I've used Protel 99SE to autoroute some very complicated boards and had good
    success. I've just had to put some forethought into what I wanted out of the
    route and had no troubles.
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