please explain ac simulation

2014-05-10
2014-05-11
  • Bengt Nilsson

    Bengt Nilsson - 2014-05-10

    I just started with qucs, and I have a difficulty with the ac simulation concept.
    I cannot find a way to define or control the input node.
    Yes, I can put a source somewhere, but it already has a frequency (usually default 1GHz) and a level. How is this connected to the simulation? And what if I have more than one source?
    The ac-simulation box is completely isolated and has no connection to my circuit and far as I can see.
    I have searched in the help and docs and I have not found this explained.
    Where should I look?

     
  • Guilherme

    Guilherme - 2014-05-11

    Have you looked at page 33 of http://qucs.sourceforge.net/docs/tutorial/getstarted.pdf

    During the AC simulation all source frequencies are controlled by the ac simulation block.

    If you have multiple sources with different frequencies you probably want to look at a transient simulation.

    You select the type(s) of simulation by placing the simulation box into your schematic.

    You can find further documentation at http://qucs.sourceforge.net/docs.html

    Regards,

     

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