Problem with AC sources

Discussion in 'Homework Help' started by Natan, May 1, 2014.

  1. Natan

    Thread Starter New Member

    May 1, 2014
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    Hi all! Does anybody have the same problem like this ? Every time when I add AC sources all the voltages and currents in the circuit turn to zero. No matter if it's Vas or Vsin the result is same - zero! Unlike DC sources that works perfectly. Here's also attached file. Thanks for help!:)
     
    Last edited: May 1, 2014
  2. anhnha

    Active Member

    Apr 19, 2012
    774
    47
    I tried that circuit in LTspice and it is fine.
    What analysis are you running?
    I think it is because you are running DC analysis instead of transient analysis.
    When you choose DC analysis, all ac sources are shorted and therefore there are no sources remaining.
     
    Natan likes this.
  3. Natan

    Thread Starter New Member

    May 1, 2014
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    Hey Anna! I tried time domain analysis before with other AC circuits and found this problem. This time I used AC sweep analysis (linear type) and got the following plot.
    Thanks a lot!
     
    • sim1.png
      sim1.png
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  4. Natan

    Thread Starter New Member

    May 1, 2014
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    I'm a student and I have a lite version but I don't think it should be the problem..
     
  5. anhnha

    Active Member

    Apr 19, 2012
    774
    47
    Hi.
    It shouldn't be a problem with transient analysis.
    Because your circuit consists of only ac sources, if you run DC analysis, all ac sources are shorted and the resulting circuit has no sources. That is the reason why all voltages and currents are equal to zero.
    AC analysis calculates the output as a function of frequency.
    May I know your purpose with the simulation? What do you want to see with the simulation?
    I don't think that is the software problem. Maybe, it is just the wrong setting for the simulation.
     
  6. Natan

    Thread Starter New Member

    May 1, 2014
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    0
    It's just a homework I did it on paper and wanted to check my self..
    Thanks a lot I'll try to see what's wrong with the setting or smthing else..
     
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