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LTSPICE signal+noise simulation

ERER

New Member
Hi

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

Thanks !
118403
 

ronsimpson

Well-Known Member
Most Helpful Member
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

New Member
Hi
Thanks for the support

I've did it
The problem is that the noise is on top the signal
118428
I need a clear signal but with some noise floor
 

ERER

New Member
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...
 

alec_t

Well-Known Member
Most Helpful Member
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

Well-Known Member
Most Helpful Member
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)
118434
Is this what you want?
118435
 

alec_t

Well-Known Member
Most Helpful Member
Something like this? :

Noise.png
 

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