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 ..

over 14 years ago

0 rfengr over 14 years ago

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 Herman Theodorus over 14 years ago 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 rfengr over 14 years ago 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 Herman Theodorus over 14 years ago 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 Mat Di over 14 years ago 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

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TINA amplitude-modulated input source, how ?