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Getting into Spice

Discussion in 'Electronic Design' started by Ignoramus22652, Apr 17, 2006.

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  1. I want to make a little control circuit, nothing major, things should
    happen in sequence with timings, etc. I would like to simulate a
    schematic in Spice. So... Are there any easy tutorials for Spice that
    would show hot to create similations like this, preferably with some
    visualizable breadboard layouts. I never tried Spice and it was on my
    todo list, and now seems like a good time to learn a little bit.

    I am planning on doing it under linux, by the way.

    i
     
  2. If you skip the Linux idea, "Switcher CAD III", a Spice simulator, available
    for free at the Linear Technology website is a good starting point, There
    are a few example circuits using the LT SMPS chips. But you can equally
    well use the software for simulating your discrete circuits. Give it a try,
    it is really fun using it.

    Regards

    Thomas
     
  3. Thomas Gallenkamp said
    There's also a great Yahoo group too.
    (Wish is was an NNTP newsgroup tho')

    http://groups.yahoo.com/group/LTspice/
     
  4. JeffM

    JeffM Guest

  5. No need to "skip the linux idea"; Switchercad runs fine under wine (in
    linux).
     
  6. Genome

    Genome Guest

    Abhorrently you can run Linux under something called Wine as well and then
    LTspice works too.

    DNA
     
  7. Thanks guys, I will try running Wine at some point today.

    I have a pretty up to date Fedora Core 5 and installed Wine. It would
    probably need a DOS partition, which I do not have, but I can probably
    do something.

    The last time I looked into Wine was about 8 years ago.

    i
     
  8. Joerg

    Joerg Guest

    If this contains analog elements in conjunction with logic models don't
    get your hopes up too much. Sometimes it works, sometimes it's less time
    consuming to built a real prototype instead before spending hours to try
    to figure out why it won't converge.

    Regards, Joerg
     
  9. Jim Thompson

    Jim Thompson Guest

    Any Spice is only as good as the models. I do quite well using the
    built-in 'HC' models in PSpice.

    The trick is the logic models must also include an analog interface
    when they are used in mixed-signal situations.

    Convergence issues are almost always cockpit error ;-)

    ...Jim Thompson
    --
    | James E.Thompson, P.E. | mens |
    | Analog Innovations, Inc. | et |
    | Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
    | Phoenix, Arizona Voice:(480)460-2350 | |
    | E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
    | http://www.analog-innovations.com | 1962 |

    Old Latin teachers never die...they just decline
     
  10. Joerg

    Joerg Guest

    Hello Jim,
    Which is why I went from Spice to Weller. Before I go looking for better
    models I have it whipped up in the lab. Which reminds me, after the
    Weller I've got to fire up the Weber.

    Yes, I know. But I tried wiggling all levers and breakers and we are
    still losing altitude :-(

    Regards, Joerg
     
  11. Joerg

    Joerg Guest

    Hello Jim,
    It was the models. Using the 74HC14 from Helmut Sennewald did it, now
    the oscillator runneth with normal reltol settings. They are on the
    Yahoo LTSpice group file section.

    IIRC they still don't but it converges.

    Regards, Joerg
     
  12. Jim Thompson

    Jim Thompson Guest

    I would imagine that a 74HC14 model by Helmut would be device level,
    NOT behavioral.

    PSpice logic models are behavioral so that, in logic-analysis-only
    mode, they are screamingly fast. However, they are cleverly designed
    such that attaching an analog device to them activates an analog
    interface... which I suspect is your problem.

    ...Jim Thompson
    --
    | James E.Thompson, P.E. | mens |
    | Analog Innovations, Inc. | et |
    | Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
    | Phoenix, Arizona Voice:(480)460-2350 | |
    | E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
    | http://www.analog-innovations.com | 1962 |

    Old Latin teachers never die...they just decline
     
  13. Joerg

    Joerg Guest

    Hello Jim,
    That is a neat trick. In my case I almost never use them as pure logic
    and if I do there is not need to simulate. I'll need the full circuit
    including substrate diodes. Because often I am, ahem, using these in
    some unorthodox fashion.

    Regards, Joerg
     
  14. Jim Thompson

    Jim Thompson Guest

    It's possible that I have device-level models for what you need.

    Contact me privately and I'll see what I can provide to you.

    ...Jim Thompson
    --
    | James E.Thompson, P.E. | mens |
    | Analog Innovations, Inc. | et |
    | Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
    | Phoenix, Arizona Voice:(480)460-2350 | |
    | E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
    | http://www.analog-innovations.com | 1962 |

    Old Latin teachers never die...they just decline
     
  15. Joerg

    Joerg Guest

    Hello Jim,
    Thanks, did that via the email link on your site. We just came back from
    Black Angus. Had a roasted French dip sandwich, along with a Guinness.

    Regards, Joerg
     
  16. Fred Bartoli

    Fred Bartoli Guest

    "Joerg" <> a écrit dans le message de
    Huh. What's that?
     
  17. Joerg

    Joerg Guest

    Bonjour Fred,
    Thinly sliced roast on a baguette (which they call french roll), with
    herbs, spices and a sauce to dip it into. The sauce is almost the best
    part. Then there are french fries. I know, I know, according to Asterix
    they were invented in Belgium when the Romans wanted to invade ;-)

    http://www.blackangus.com/menu/lunch/sandwiche.htm
    (4th item on that menu page)

    Regards, Joerg
     
  18. joseph2k

    joseph2k Guest

    Nonsense, it is known to be very happy running in wine. It is perhaps the
    best behaved program for testing wine. (It may work even if nothing else
    does.)
     
  19. joseph2k

    joseph2k Guest

    That's not all, there is Geda and friends (GAF) a true GNU / Linux
    implementation of a full electronic EDA suite.
     
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