Signal to noise ratio

[Pukhtun_Yum]

Hello Everyone, I hope everyone is fine and enjoying good health.

Attached image shows multiple maximum and minimum points of a chopper modulated signal, in order to find the signal to noise ratio can I

use the following formula to get signal to noise ratio

X = (Mean (Max Points) - Mean (Min Points)) / Mean (Min Points)

S/N = 10 * log * Square(X)

Does the Mean of Min points represents the noise of the signal ?

[GerdW]

Hi Yum,

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@Pukhtun_Yum wrote:

Does the Mean of Min points represents the noise of the signal ?

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When the minimum points are also part of your signal (as it seems) then they don't represent noise…

[Pukhtun_Yum]

How can i find the noise voltage if the minimum points do not represent it ?

[GerdW]

Hi Yum,

you may subtract the expected signal from your measured signal. The difference will be the noise…

[Henrik_Volkers]

Since you have a periodic signal, I would do it in the frequency domain.

You should see the peaks at n x f_0 and the noise floor.