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Frequency domain simulation in Pspice

Discussion in 'Electronic Design' started by Eli, Mar 11, 2006.

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  1. Eli

    Eli Guest

    Hi peaple,

    I try to build pspice simulation to a curcuit which I designed in
    Orcad. The simulation should be in Frequency domain. In "Simulation
    settings" I selected AC sweep option, logarithmic(decade) AC sweep
    type.

    Start F=10
    End F=100k
    Points/Decade=100.
    Unfortunately the simulation is failed because of the following:
    no AC sources - AC sweep ignored.

    But AC source is defined(Vsin) ! The only thing I think may be the
    problem is the AC source in the Orcade shematics has a defined
    frequency. Am I right ?
    How can I fix the problem ?

    Thanks in advance,

    Eli.
     
  2. Jim Thompson

    Jim Thompson Guest

    "VSIN" isn't an AC source, it's a sine wave voltage source.

    Use part "VAC" (although you can still use "VSIN" but add AC=1 in the
    selections).

    Also make sure your .AC calls the source by its _reference_name_!

    ...Jim Thompson
     
  3. Eli

    Eli Guest

    Dear Jim,

    Thank you very much for your helpful advice. Now the problem is solved.
    But would you please explain me the meaning of the AC=1 selection ?

    Best Regads,

    Eli.
     
  4. Jim Thompson

    Jim Thompson Guest

    Normalization... "1" = 0dB

    For experiment sake, change to AC=0.1 and see what you get.

    ...Jim Thompson
     
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