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Do Designers Do Spice Hopping?

Discussion in 'Electronic Design' started by D from BC, Jan 14, 2007.

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  1. D from BC

    D from BC Guest

    Huhhh..another simulator to learn...
    First Microcap...then Circuitmaker 2000..then Electronics Workbench
    (and it's as rebirth as Microsim)...then Protel...then some misc
    magnetics progs..then Orcad.. :p

    Are designers doing this too...Call it spice hopping?

    And now I'm checking out LTSpice and reading the documentation:

    Taken from:
    http://ltspice.linear.com/software/scad3.pdf
    "SwitcherCAD III is designed to be used by three different
    types of design engineers: those who know what they're
    doing, those who think they know, and those who are sure
    they know absolutely nothing about switching regulator
    design. The experienced designer needs a "what if" program
    that allows him to quickly alter aspects of a circuit to
    find an optimum design. The neophyte needs a cookbook
    approach that yields a reliable design based on the
    simplest of inputs. The "loose cannon" designer needs a
    program that will allow him to exercise his free will, but
    will be intelligent enough to alert him to fatal design
    flaws."

    I really like the writing style..
    "loose cannon" designer :)



    D from BC
     
  2. Tim Shoppa

    Tim Shoppa Guest

    For better or worse, this happens a lot.

    Probably worse. The reason I have to do it is that a SPICE model for
    part X only runs in some commercial SPICE version Y, so if I gotta use
    that part in SPICE then I might think I need to use only that version Y
    of SPICE.

    In real life, 90% of the time the reason they say it only runs in SPICE
    version Y is because that's the only place they tried it. Often with
    minor syntax changes it will run just as well in my favorite SPICE :).

    That doesn't mean the model is useful in any version of SPICE! Almost
    all the models even for jellybean parts are useless outside some really
    boring range of parameters where the part is perfectly linear, and you
    could do just as well (and a lot Faster and with much better
    Understanding) on the back of a napkin.

    The place SPICE really is useful at is if you really honestly trust all
    the models, and for me there's a pretty long list of discrete parts
    where I know exactly where to trust the models. So there is zero reason
    to use any of those newfangled integrated circuits!

    Tim.
     
  3. D from BC

    D from BC Guest

    That's what happened..Some newfangled IC's caught my attention. So I
    got sucked into LTSpice.. ("It's a trap.")
    All because I'm just trying to save time....
    I'm attempting to dodge the time to learn spice file syntax changes
    and also to dodge the time creating macro models or equivalent
    circuits using all the basics.
    Hopping to another spice program seemed like a short cut.

    Sometimes I think the more I use spice... the more I get blind and it
    becomes my walking stick :)

    Thanks for the feedback..

    D from BC
     
  4. Tim Shoppa

    Tim Shoppa Guest

    It's not as bad as it was in the late 80's/early 90's, where
    Universities were churning out "EE graduates" who had undergone an
    intense 4-year course in how to run a specific VLSI design software
    tool and nothing else.

    I gotta admit, looking back 20 years it made sense, as that was what
    all the big semiconductor houses thought they needed to hire lots of.
    But it's more frustrating today than it was 20 years ago.

    And I myself have carved a niche by being an expert in some really
    super-duper obscure software tools when what I really enjoy is not the
    tool but the results, but everyone's convinced that I'm the guy they
    have to hire just because I know tool X and have used it to do A, B, C,
    and D really well.

    Sort-of reminds me of when I took a Chaucer class as an undergraduate,
    me a techie/science/engineering dweeb among a whole bunch of literature
    majors. When the professor was handing back the big term paper, he was
    making complimentary remarks about what he really liked in each
    student's work. When I got mine back, the comment was "nice printer!".
    (I had typeset it using LaTeX and some macros used extensively for
    writing Physical Review papers...)

    Tim.
     
  5. Genome

    Genome Guest

    Didn't Chaucer write about one of the meetings of 'The English Society for
    Bestiality' and how they met up in a Pub to drink beers and talk tails?

    DNA
     
  6. Jim Thompson

    Jim Thompson Guest

    "talk tails" ??? Bwahahahahaha!

    ...Jim Thompson
     
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