LTSPICE signal+noise simulation (2025)

Hi

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

Thanks !

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.

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

ERER said:

need a clear signal but with some noise floor

Click to expand...

Do not understand.

Hi

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

Hi

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

eT

ERER said:

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

Click to expand...

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

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?

ronsimpson said:

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

Click to expand...

YES ill try

Something like this? :