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# TINA amplitude-modulated input source, how ?

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 ..

• 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;

rfengr,

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

Herman

• In reply to Herman Theodorus - WEBENCH Design Center:

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;

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?

• In reply to Herman Theodorus - WEBENCH Design Center:

Dear Herman,

Can you please explain further how this can be done?

Perhaps you can show the diagram.

Thanks

Mat