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SW for drafting 'analog' timing diagrams?

Discussion in 'Electronic Design' started by Joerg, Jan 5, 2006.

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  1. Joerg

    Joerg Guest

    Hello All,

    Is there a simple share/free tool that allows to draw timing diagrams
    where some of the wave forms are not digital? For example where some of
    them are coming off a simple filter such as an RC?

    I don't want to buy something fancy here because I'll most likely need
    it only once, for a publication. I could whip up the logic and filters
    in SPICE but then the import of its printout into something where I can
    add markers would be rather kludgy.

    Drawing a nice enough e-function by hand isn't a pretty sight either,
    even if I'd abstain from coffee for two days.

    Regards, Joerg
  2. Excel spreadsheet? If you don't have excel, download open office.
  3. Joerg

    Joerg Guest

    Hello Frank,
    That is one option. But when I tried that the last time it resulted in
    waveforms that were a bit jagged at the edges. Ok for a module spec but
    not quite for a publication.

    In the old days we had DOS programs that could draw really nice timing
    diagrams. They could plot finite transition times but they'd fail when
    you wanted to illustrate things such as a capacitive load.

    Regards, Joerg
  4. Genome

    Genome Guest

    I'd buy a HDTV.

  5. Rich Grise

    Rich Grise Guest

    Not necessarily - what file format(s) can it output? With a decent paint
    program, like Paint Shop Pro 4,
    you can do some pretty snazzy illustrating. And, you can do a screen
    capture if you don't like your spice output file format(s). :)

    Heck, export some graphics, put them on a website or in a.b.s.e,
    and I'll see what I can do with them, if you'd like.

    Good Luck!
  6. Joerg

    Joerg Guest

    Hello Rich,
    Oh, you can get a bitmap. Things is, to create really equidistant
    rastering in Paint can be a pain.

    Maybe I'll just do that. But I'll experiment for myself a little. Just a
    matter of pride, ya know...

    Regards, Joerg
  7. qrk

    qrk Guest

    I've been using Gnuplot for making pretty graphs for reports and
    helping out a colleague with graphs in his book. If you can describe
    your waveforms as equations and/or table data, you can make some
    pretty spiffy graphs. Allows many types of outputs such as terminal
    display, EMF, Postscript, PNG, HPGL, and lots more. If you decide to
    go this route, I have a Windoze batch file that may be of interest if
    you need to deal with many plots.
    Runs on a variety of operating systems
  8. Joerg

    Joerg Guest

    Hello Mark,
    Thanks for the hint. I read the docs a bit and it seems to be strictly
    command line driven. I like that but this means a long learning curve.
    But I did find that one fellow newsgroup poster from Europe was a
    contributor. Interesting.

    Regards, Joerg
  9. qrk

    qrk Guest

    Another thought is Matlab or some other math program with nice
    graphing features.

    You can create a simple Gnuplot graph in a couple minutes after
    installing the program. It took me many hours/days to figure out all
    ways to control the damn plotting, annotation and formatting. I have a
    text editor open and just drag and drop the file from Explorer on the
    Gnuplot window for instant gratification. Once you figure this program
    out, you will find many uses like doing a GPIB dump and plotting the
    results, perhaps with some smoothing, all via a batch file. For
    documentation, I like using EMF files since they scale nicely in word
    processors and PDF documents.

    A simple example showing some of the basic features:

    # Simple Gnuplot example
    set term windows "Arial" 10
    set grid
    set xtics 90
    set style line 1 lt 8 lw 2
    set xrange [0:360]
    set yrange [-10:10]
    set dummy angle
    plot tan(angle*pi/180.0) linestyle 1
  10. Joerg

    Joerg Guest

    Hello Mark,

    GPIB dump? Now that would be cool. Most of the lab gear only works with
    these dreaded HP inkjets, other gear dumps raw data without any printer

    Sometimes I cheat and snap a screen picture with the digital camera. But
    a GPIB dump sure would look nicer.

    Regards, Joerg
  11. Joel Kolstad

    Joel Kolstad Guest

    Are you aware of this piece of free software? -->

    It's great... we use it with an old 8753C network analyzer and a few spectrum
    analyzers to get screen dumps into 'nice' documentation (Word files).
  12. Joerg

    Joerg Guest

    Hello Joel,
    Thanks. That looks great. Is it by the same John Miles who sometimes
    posts here?

    Regards, Joerg
  13. JeffM

    JeffM Guest

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