#### jn_mohit

##### Newbie level 4

**SNR in sigma delta**

I am trying to find SNR of a sigma delta modultor, I have tried a lot but not able to come to conclusion as different writers use different procedure to calculate it.

I have simulated the system in simulink, I dump the input and output in the workspace. I take the fft and find abs(fft), what do i do now.

Let

fb: be max frequency of input,

fn = 2fb i.e. Nyquist frequency

fs: be the smapling frequency.

N = no. of points generated in input/output (2^13 is what i usually choose)

can anyone guide me how do i calculate SNR.

Thanks