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Good mixed signal Simulaor ??

Discussion in 'Electronic Design' started by Matrix, Jul 14, 2006.

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  1. Matrix

    Matrix Guest

    Hi all
    i need a good mixed signal simulator which can meet my most analog
    simulation requirements and some digital interfacing as well. Also it
    would be of great help if i could get the models for the NEW OPAMPs of
    Linear, Analog & TI etc or i could create such models as per my current
    selections of opamps to get the better/realistic response of the
    circuit. i am not satisfied with Multisim Electronics workbench 2001,
    Circuitmaker 2000 and protel 99se simulations or performance which is
    sometimes very unpredictable/inconsistent. thanks

    PLEASE DO MENTION THE VERSION ALSO FOR THE RECOMMENDED PROGRAM.!!
     
  2. Joel Kolstad

    Joel Kolstad Guest

    LTSpice, from Linear Tech's web site, is free and very good for the price.

    For commercial offerings, I'd suggest SIMetrix by Catena is quite good (you
    can also get the SIMetrix engine bundled in various schematic capture/PCB
    tools such as Pulsonix).
    In general one just downloads these the manufacturers' web sites.

    ---Joel Kolstad
     
  3. LTSpice isnt really a mixed-mode simulator. e.g. As far as I am aware it
    doesn't have clocked D/JK types.
    Simetrix is a tad expensive.

    Kevin Aylward B.Sc.

    http://www.anasoft.co.uk
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.

    "There are none more ignorant and useless,than they that seek answers
    on their knees, with their eyes closed"
     
  4. Guest

    It does have a D-type and an S/R. The last time I looked it didn't have
    a T- or a J/K.

    Building one is on my might do list.
     
  5. Matrix

    Matrix Guest

    i have downloaded and tried LTSpice but there isn't option for
    different type of sources to activate the circuit e.g. sine/triangular
    wave to feed into an opamp circuit. if it has got then please inform me
    or how could i do that alternatively. thanks
     
  6. Guest

    Do you REALLY need a simulator, probably not. As you have allready
    noticed they dont perform very well. Getting good results requires
    years of experience and an expensive setup, very much a LAST resort,
    you simulate when there is no practical alternative. Save your money
    and buy some test gear, learn to build and measure. Not only is this
    better but mostly its quicker as well.
     
  7. Damir

    Damir Guest

    Ask here: http://groups.yahoo.com/group/LTspice/

    Regards,
    Damir
     
  8. Guest

    Hi there.
    Of course LTSpice can do sine/triangle / other waveforms. Would'nt be
    much use if it could not.Click the "Component" icon(AND gate symbol) .
    Select "voltage" source.
    Place that. Right click on the symbol and choose "Advanced". You can
    set up your
    waveform from there.Triange you can make with PWL or use a pulse
    waveform with total rise and fall times equil to the period and no
    "Ton".
    Hope this helps.
    Cheers
    Rob
     
  9. Jim Thompson

    Jim Thompson Guest

    PSpice A/D.

    ...Jim Thompson
     
  10. Genome

    Genome Guest

    For fucks sake.... it's like having a wank.

    Either it comes naturally or you have to work at it.

    DNA
     
  11. Jim Thompson

    Jim Thompson Guest

    Bwahahahahahaha! ROTFLMAO ;-)

    ...Jim Thompson
     
  12. Only if you don't know how to drive it properly. Spice itself performs
    brilliantly.

    Spice is cheap, so no on that front. Yes, typically, to be useful as an
    analogue designer, you need at least 5 years of post graduate
    experience, irrespective of whether you use spice or not.
    Oh dear...here we go again...complete nonsense. Try designing a 10,000
    transistor circuit on the bench. Its just not going to happen mate.

    Again, for the Nth time, spice simulators are *mandatory" for any
    analogue ic design. For pros that really know how to use spice, spice
    for board level design is still bread and butter.

    Yes, real gear is very, very useful, but so is knowing spice. For i.c.
    design, all products are designed entirely using simulation with, many,
    many working completely correctly on 1st pass silicon. This is the way
    it is. No amount of "hey, spice is not the real world" will change the
    facts of what is actually done in ic companies on a day to day basis,
    successfully.

    Sure, it can be a bit more work in board level to get the models ok, but
    someone who actually knows what he is doing, does this with little
    trouble. Its only the novices and inexperienced that cant get spice to
    give accurate, realistic results for all but the most stubborn board
    level circuits.
    No it isnt.
    No it isnt.

    Kevin Aylward B.Sc.

    http://www.anasoft.co.uk
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.

    "There are none more ignorant and useless,than they that seek answers
    on their knees, with their eyes closed"
     
  13. Guest

    At last you agree with me.



    And for the Nth time the op isn't intersed in ic design.

    Once more your still banging on about the irrelevant.

    It sure is.
     
  14. He is interested in analogue design. Analogue IC design point the
    correct way to board level design.
    Nope. Illustrating that for the *majority* of analogue applications,
    Spice is absolutely indispensable.

    Oh? Your a mindreader than?

    However, based on logic, to wit:

    "would be of great help if i could get the models for the NEW OPAMPs of
    Linear, Analog & TI etc or i could create such models as per my current"

    Its seems he is doing generic circuit circuit design.
    Complete nonsense. You have not got a bloody clue what your talking
    about.

    Been there mate. Analogue, board design for many years in addition to
    many years ic design. Spice is the way to go for both. Not debatable.
    Once you become a real analogue engineer you will understand why.
    Ho humm...the differance is in line with why we PCs use software to
    program them. A hardware version of Excel would be a tad tricky.
    Crap. It takes a few seconds to set up a simulation, bloody hours
    soldering up a circuit.


    Kevin Aylward B.Sc.

    http://www.anasoft.co.uk
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.

    "There are none more ignorant and useless,than they that seek answers
    on their knees, with their eyes closed"
     
  15. Guest

    What rubbish, Spice was only invented because you cant breadboard an
    ic.
    I wonder how we managed before spice?

    How can he be an expert if he's asking this question?
    waste of cash. Hopefully he will realise buying yet another simulator
    would waste even more.
    So you cant actually answer the question then.

    Some years ago I made the mistake of buting EC2 simulator (Tatum labs).
    I couldnt get a 4 transistor amp to simulate so I phoned up the
    supplier (Those Engineers) he said "no problem come down tomorrow and
    i'll show you how to do it". Eight hours later he still couldnt even
    get a DC analasis, bear in mind it's just 4 bjts and a few resistors,
    just like you as I was leaving he was still telling me how easy it was.
    I know your going to tell me things are much better now but as you have
    a simulator to sell you would wouldnt you. Yes it did take hours to
    build but as I had to build it anyway it hardly matters. I guess if all
    you make is "virtual products" the simulation is ok after all it doesnt
    much matter if its not quite right.
     
  16. Sjouke Burry

    Sjouke Burry Guest

    Wow, so I wonder how I have been designing
    stuff for 40 years.Must have been in my
    imagination.....
    (I have never used any simulator for electronics).
     
  17. Jim Thompson

    Jim Thompson Guest

    I've been designing for ~50 years...

    But you've not designed something with a few thousand transistors in a
    single circuit.

    ...Jim Thompson
     
  18. Sjouke Burry

    Sjouke Burry Guest

    Well.. One of my designs needed a 5v 50 amp
    supply,did not count the components, but I
    used a 19 inch rack 1.8 meter high to store
    it all.
     
  19. Jim Thompson

    Jim Thompson Guest

    Piker! I did a 5V/400A supply for an acoustic imaging machine about
    30 years ago ;-)

    ...Jim Thompson
     
  20. I agree 100%.

    We used to sim everything we built. Works great as long as one
    knows where and when certain parasitic effects need to be included,
    etc. (or not). If you don't include ALL the parameters of your
    circuit in a sim set up, it is obviously not going to behave in the
    manner your real world set up behaves.

    Whenever there is such a disparity between one's circuit and one's
    sim, one has left out a parameter of the circuit's operation in the
    sim setup that affects it adversely enough to yield a significant
    difference in the results observed over the results calculated and
    displayed. When they match up, one actually reinforces one's
    knowledge of electronics due to the fact that one was able to locate
    and include all the elements of the physical circuit that affect its
    function or operation. A good sim package, and a good sim engineer
    makes a good sim package one hell of a goo learning tool.

    Complaining that sims never work merely means that what is really
    going on is the engineer or technician in question is not working at
    full capacity. Put ALL of the parameters in, and get reliable
    results... it really is that SIMple.

    Even works in realms where parasitics are rampant, such as High
    Voltage Power Supplies or Micro-Wave RF gear.

    Since it works so well when it is set up correctly, this can only
    mean that a non functioning sim points to operator error, and or a non
    functioning SIMgineer. :-]
     
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