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Question for LTSpice Users

Discussion in 'Electronic Design' started by Jim Thompson, Jan 4, 2007.

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  1. Jim Thompson

    Jim Thompson Guest

    Has anyone used anything other than the provided schematic entry for
    LTSpice?

    What I have in mind is using my venerable MicroSim Schematics as a
    frontend for LTSpice.

    I have dozens of years of collected symbols... too late to teach an
    old dog new tricks.

    Thompson is about to bail from PSpice... a continual money-hole with
    no improvements in years... they haven't even fixed the bugs I
    reported 5 years ago :-(

    ...Jim Thompson
     
  2. John  Larkin

    John Larkin Guest


    LTspice schematics are simple ASCII text files. If you can somehow
    export your old stuff in some understood, preferably text, format, it
    wouldn't be monstrous to write a Basic or Pearl program to do the
    conversion.

    John
     
  3. Jim Thompson

    Jim Thompson Guest

    MicroSim Schematics is text-based as well. However, MicroSim
    Schematics is one of the best tools ever written... I want to continue
    using it.

    ...Jim Thompson
     
  4. EE123

    EE123 Guest




    Which version of PSpice are you using?


    Dave
     
  5. Genome

    Genome Guest

    You can copy and paste a spice netlist file as a spice statement in the
    LTspice editor window and things seem to run........ So use MicroSim to
    generate a .net file and carry on.

    It's not elegant but....

    ..include filename.net doesn't seem to work but there may be something
    similar that does.

    Watch out for the license agreement!

    You may as well e-mail Mike for a better answer, unless you are not mates
    anymore.

    DNA
     
  6. Jim Thompson

    Jim Thompson Guest

    v15.7 (by the new Cadence numbering system). But Schematics itself
    hasn't changed in years... except for the mucking around by Cadence
    "developers" (you know, the ones recently mentioned in the news as
    admitting to having little dicks :)

    For instance, the recent release lost its ability to handle paths to
    accessory tools if the path name had spaces... as in Program Files :-(

    Took some finagling to cure...

    TEXTEDITCMD=C:\"Program Files"\"IDM Computer
    Solutions"\UltraEdit-32\uedit32.exe

    Isn't that crazy ?:)

    ...Jim Thompson
     
  7. Jim Thompson

    Jim Thompson Guest

    Which license agreement would that be?
    I would, but I've misplaced his address :-9

    ...Jim Thompson
     
  8. Jim Thompson

    Jim Thompson Guest

    Oooops! I DO HAVE a request for a switcher design here on my desk ;-)

    ...Jim Thompson
     
  9. Genome

    Genome Guest

    Well..... help|about gives you an e-mail address for comments and bug
    reports. Each time I've used it Mike was the person who replied.

    License...... help|help topics|License Agreement/Disclaimer.....

    "This program is specifically not licensed for use by semiconductor
    manufacturers in the promotion, demonstration or sale of their products.
    Specific permission must be obtained from Linear Technology for the use of
    SwitcherCAD III for these applications."

    OK it does not sound like it specifically prevents you from using the
    software to do what you do but it might be interpreted that way. I'm sure
    Linear Technology would take a dim view of things if you started using the
    software to design stuff that encroaches on their market.....

    Play the 'White Man' and ask before you get stomped on...

    DNA
     
  10. Joel Kolstad

    Joel Kolstad Guest

    Clear indication of programmers who either (1) are pretty mediocre or (2)
    don't actually use their own tools.

    In the case of ORCAD these days, I'd imagine both apply.
     
  11. qrk

    qrk Guest

    LTspice will read the Schematics net list output. I was doing that
    back a few years ago on "that" project. PSpice does have a nicer
    graphing utility, so it would be spiffy if you could convert the
    LTspice output file to something PSpice's graphing utility could
    swallow. Although, I really like how LTspice shows graphical results
    as it is running the simulation.
     
  12. Jim Thompson

    Jim Thompson Guest

    My intense aggravation is driven by the fact that they mucked with a
    working tool that they "no longer support"... I guess "no longer
    support" means "kill it" :-(

    ...Jim Thompson
     
  13. Jim Thompson

    Jim Thompson Guest

    And an almost criminal intent to do damage...

    TEXTEDITCMD="C:\Program Files\IDM Computer
    Solutions\UltraEdit-32\uedit32.exe"

    worked when entered from the Schematics set-up tab, also double quotes
    "" ... ""

    but were removed during the re-write of the INI file.

    That looks to be an "on purpose" damage attempt to me.

    ...Jim Thompson
     
  14. Nico Coesel

    Nico Coesel Guest

    No, its actually quite common to place "" around paths. The routine
    parsing the path needs some way to tell where the path ends.
    Especially when multiple paths can be specified.
     
  15. Genome

    Genome Guest

    Ooooooh me-gosh. Just call me jealous.

    DNA
     
  16. Jim Thompson

    Jim Thompson Guest

    1W / ±40V

    ...Jim Thompson
     
  17. Guest

    Netlisting is more than half the battle. Why not just feed the netlist
    to any number of other spice simulators out there. Ngspice for
    instance.
    http://ngspice.sourceforge.net/
     
  18. Speaking (opposite) of which, I like this story about the Altium CEO
    using his own tools:
    http://www.fpgajournal.com/articles_2006/20060822_altium.htm

    Dave :)
     
  19. Joel Kolstad

    Joel Kolstad Guest

    Nice article, although I question a couple of its claims:

    "For any reasonably complex software system with more than about two serious
    users, the number of bug reports and change requests will far outpace the fix
    rate of the development engineers" -- Hopefully they wouldn't state this if
    they were only talking about *bug reports* and not *bug reports AND change
    requests*.

    "One of the classic problems faced by users of electronic design automation
    software is that the developers of the software are, by necessity, software
    engineers." -- What makes them think this? Personally I'd prefer software
    programmed by a really good hardware engineer who happens to be an average
    programmer long before software programmed by a "software engineer" who never
    did any real hardware design. In the former case, at worst you tend to end up
    with weird GUIs and odd ways of getting things done, but in the later the
    software doesn't work at all for its intended purpose.
     
  20. Maybe programs like EDA tools are just so huge and complex these days
    that it might actually take "software engineers" to do it? Hardware
    engineer "programmers" usually want to do it all themselves and don't
    play well with other programmers :->, that may not be conducive to huge
    software development efforts!
    Very true in many cases.

    Dave :)
     
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