LTSPICE signal+noise simulation

[ERER]

Hi

I would like to simulate such signal (Attached)
Can someone help me how to do it ?

Thanks !

 

[ronsimpson]

In LTspice, use a "behavioral voltage source" component in series with the signal source you need to make noisy. Set as "V=(rand(time*1e18)-0.5)*1.0".

Two signals in series. The outputs will add together. One signal is "signal" the other is random.

 

[ERER]

Hi
Thanks for the support

I've did it
The problem is that the noise is on top the signal

I need a clear signal but with some noise floor

 

[ronsimpson]

need a clear signal but with some noise floor

Do not understand.

 

[ERER]

Hi

I need along with the signal a random noise across zero
Like this:

 

[ronsimpson]

That is two signals.

 

[eTech]

Hi

Use Ron’s example but try white() function with random() function instead.

eT

 

[ERER]

Ok my friend
But how can i simulate those two signals on one same line ?
Now the noise is over my signal, and i dont want it...

 

[ronsimpson]

Erer,
Your words are not working for me.
Do you want one or two signals?

 

[alec_t]

But how can i simulate those two signals on one same line ?

A signal line cannot be at two different voltages at the same time.

 

[ronsimpson]

If you really want "one" but have "two" you could make a component that has these two voltage sources inside. (it will look like one)

Is this what you want?

 

[ERER]

If you really want "one" but have "two" you could make a component that has these two voltage sources inside. (it will look like one)
View attachment 118434
Is this what you want?
View attachment 118435

YES ill try

 

[alec_t]

Something like this? :