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TINA amplitude-modulated input source, how ?

rfengr
Intellectual 720 points

Hello,

Is there a way to have an amplitude-modulated input source to my circuit ?

I need a 5MHz carrier signal, modulated by a 200KHz signal.

Is this possible ?

also, is it possible to add white noise ?

Thank you ..

  • 0
    Intellectual 720 points

    OK, I figured it out ...

    It turns out that it is not easily done in the basic-free version on Tina because the "user defined function" is disabled.

    I tried a trial full version and was able to generate a modulated signal using the equation editor in the function generator:

    { Use this template to create your
      own signals }
    Function Signal(t);
    Begin


    A:=0.1;
    m:=1;
    fm:=200000;
    fc:=5000000;
       Signal := A*((1+m*cos(2*pi*fm*t))*cos(2*pi*fc*t));

    End;

  • 0 in reply to rfengr
    TI__Genius 9775 points

    rfengr,

    Alternatively, you can simply use two voltage sources and multiply them together (using POLY(2) VCVS for instance)

    Herman

  • 0 in reply to Herman Theodorus
    Intellectual 720 points

    Thanks Herman,

    I haven't tried your way, but I really like the equation editor method. I was able to generate a ringing effect using the equation below.

    By the way, what language does this equation editor use, are there any references out there on how to setup variables, functions, etc .. ?

    { Use this template to create your
      own signals }
    Function Signal(t);
    Begin
    A:=0.0005;
    m:=1;
    fm:=200000;
    fc:=5500000;
       k    := 0.0000005;
       mysig1:= 2/2.71828183^(t/k);
       Signal := mysig1*A*((1+m*cos(2*pi*fm*t))*cos(2*pi*fc*t));

    End;




  • 0 in reply to rfengr
    TI__Genius 9775 points

    I do not know the answer to your question, but I can ask around. Which full version do you use? 7.x or 8.x or 9.x?

  • 0 in reply to Herman Theodorus
    Prodigy 10 points

    Dear Herman,

    Can you please explain further how this can be done?

    Perhaps you can show the diagram.

    Thanks

    Mat