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TINA/Spice: PROBLEM FOR A NEWBIE : TOOL IS UNABLE TO PROVIDE OUTPUT, WHEN TWO VOLTAGE GENERATORS IS GIVEN IN A SINGLE SCHEMATIC.

Tool/software: TINA-TI or Spice Models

I am trying to simulate LISN circuit in TINA 9.3.1. The VG1 is to give 230Vrms mains supply to the circuit. To provide noise for my circuit i added VG2 at the load. Now when i perform transient analysis, a pop-up came saying, Only one input is allowed !.... How am i able to say that my circuit is able to ground the noise and provide stable impedance, without applying noise to my terminals and check in signal analyzer.

Another problem i observed is, if i applied VG2 to the circuit, VG1 is generating 110fVrms.... which literally translates that VG1 is not switching on.

Please, Solve my problem ASAP....

  • Jayanth,

    Double-slick on one of the sources.
    In the pop-up window that appears, select the IO Sate pull-down and change the status from Input to None.

    The error should go away.

    Regards,
    John

  • In reply to John Miller - WEBENCH Design Center:

    Thank you sir, It was helpful..

    I have another question....
    I want to give 230VAC mains to the circuit as given above. In India, the domestic power outlet is limited with 5A.
    But in TINA I am unable to create that environment. Because, in the nodal voltage calculation, i am getting on 41A is delivered by the Function generator.
    So if there is any provision of creating 230VAC mains virtually with current limiting at 5A, please help me how to find it and use it.
    If it is not available, please give any alternative to simulate real time conditions.
  • In reply to jayanth pasumarthi:

    Jayanth,

    I am pretty sure you can get what you want by placing modified a current-dependent voltage source (H source) between your signal source and the load.
    It will need a conditional IF/THEN statement to make it limit the voltage dependent on the max current.
    Something like:

    H1 OUT IN VALUE = {IF(Imon > 5, V(IN)-230, 0)

    It will have to be a custom subcircuit that you can import into TINA.

    You can find the details of setting up the IF/THEN statement in most Spice references.
    An app note about importing subcircuit models into TINA using the new macro wizard can be found at:

    Regards,
    John

  • In reply to John Miller - WEBENCH Design Center:

    Sorry Jayanth.
    The link to the app note didn't appear in my latest reply. To find the app note, go to ti.com and search on SLVA257.
    The search should result in a document titled "Importing a SPICE NetList into TINA9-TI".
    It will show you how to import a netlist model.
    Regards,
    John
  • In reply to John Miller - WEBENCH Design Center:

    Thanks for the reply john,
    In the document you suggested, there is only about importing the PSpice netlist. But i am a bit confused about
    1. What is a netlist model ? and
    2. How to make it ?
    In addition to that, I'm unable to understand, which netlist model to be used to get the H source ?
    Please enlighten me...
  • In reply to jayanth pasumarthi:

    Jayanth,
    Sorry I wasn't clear.
    The solution to your problem will require custom models that are not built into TINA.
    That is the "netlist model" mentioned in my last reply.
    You can find more information about this topic in references devoted to Spice, the circuit analysis/simulator supported by TINA.
    Regards,
    John
  • In reply to John Miller - WEBENCH Design Center:

    Can u please share any link to refer those documents, if possible ?

  • In reply to jayanth pasumarthi:

    Jayanth,
    There are many published references about using Spice and managing Spice models.
    If you want basic, structured info, try searching on "spice modeling examples" and look at links to university classes on Spice.
    That is a good way to get started.
    Regards,
    John

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