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Throw away your network analyser and use Spice!

Discussion in 'Electronic Design' started by Paul Burridge, Aug 11, 2004.

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  1. Hi,

    This is rather interesting so I thought I'd invite some views on it.
    Please see the posting to a.b.s.e for details of the schematic.

  2. John Larkin

    John Larkin Guest

    You are a genius! Now we can throw away *all* of our test equipment
    and just go directly to simulation.

    It pains me, now, to think of all the money I've wasted over the years
    on oscilloscopes and DVMs and signal generators that I actually never

  3. Jim Thompson

    Jim Thompson Guest

    Why do you respond to Burridge's posts? If everyone simply ignored
    him he'd go back to basics where he belongs, although I'm not sure
    he's even up to that. He's clearly depriving some village of an

    ...Jim Thompson
  4. If you feel you have something useful to contribute, please do so.
    Such vulgarity has no proper place on a public discussion group.

  5. terry

    terry Guest


    best not to think about how accurate the model is.

    I have however toyed with the idea of "building" a mathematical model of a
    frequency response analyser (ie vector voltmeter) in spice, for "measuring"
    the transfer function of circuits. Such a beast is very hard to make in
    practice, but the actual maths involved is quite simple. Dragan Maksimovic
    wrote a really neat paper a couple of years back in which he used multiple
    spice transient simulations to do much the same thing.

  6. Great Paul,
    how often is you model a bit different to reality ?

  7. terry

    terry Guest

    Neat! I downloaded it, and a whole bunch of other goodies. But when I said
    "circuit" I really meant switching power supply of some description - eg
    motor controller, ups etc. That way I could do large-signal as well as
    small-signal analyses, and include nasties like nonlinear inductors etc. I
    do a lot of analysis using simulink, but the switching-level stuff is
    important too. Especially if I want to look at say how a ZCT tack-on
    modifies the dynamics of a 3-phase current controller.

    That said, I really like RFSIM99. And ya cant beat the price!

  8. It's not my idea, Rene. It was kindly mailed to me by Robert Hickey of
    Triquint Semiconductor. So if it is an unacknowledged work of genius,
    it's he that deserves the credit for it, not I!
  9. That's certainly one highly useful piece of artillery for the RF
    I don't think it actually allows one to *extract* S- parameters
    through modling a BJT, for example.
    I haven't had the chance to check it over in detail yet, but it seems
    you have to insert already predetermined S-params from datasheets or
    wherever and it will generate matching networks from there. So it
    doesn't actually amount to a 'virtual VNA' - or does it??

  10. Your suggestion needs ramification!

    Why don't you disconnect your Brain from all sensors like eye's, ears,
    skin, etc. and also all actuators like muscles and such ?

    Raymund Hofmann
  11. John Larkin

    John Larkin Guest

    If you draw a part as a lumped equivalent schematic (ie, a Spice
    model) it will give you the s-params. If you are very lucky, the part
    manufacturer will give you that Spice model; few do.
    I think it will do that, too.
    I don't entirely know what you mean by that. It will give you the
    s-params of a given simulated network.

    The really hard thing is to have the s-params and go backwards to a
    lumped Spice model. There is some software that does this, but I don't
    know of any that I can afford.

  12. So does your arse. Shove your 'contribution' up it.
  13. Active8

    Active8 Guest

    Does this mean he lives in a big town where there are so many idiots
    that it's a toss up whether he's *the quintessential* idiot?

    Notice how he put sed in the groups line *twice* ?!
  14. Active8

    Active8 Guest

    Heh, heh, heh. You *can* measure s-params from a circuit in
    (P)Spice, but Burridge has me killfiled and will never know it if no
    one replies to me - not that he'd listen :)
  15. Active8

    Active8 Guest


    The vendor article I read has a better way to do it. Probably doable
    in RFSim, too. I just looked at the moron's abse post.
  16. John Larkin

    John Larkin Guest

    Oh, that's why my replies are all posted twice!

  17. Active8

    Active8 Guest

    Really? :) I removed one of them so I can't get that effect from my
    post, but I only see yours once, also.

    Maybe 40tude Dialog removed the dupe. Same with JT and he's using
    Agent, also.

    X-Newsreader: Forte Agent 1.93/32.576 English (American)

    X-Newsreader: Forte Agent 1.91/32.564
  18. Never mind, John, that's only half as often as Activat8's and at least
    yours are correct.
  19. Active8

    Active8 Guest

    You aren't smart enough to evaluate the correctness of a reply.
    You're a bitch that needs to be spoon fed.
  20. John Fields

    John Fields Guest

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