#### naalald

##### Full Member level 4

**delta sigma modulator**

Hi All,

The attached are the simulink model of a 1st order delta-sigma modulator and its result. But when I compare the output fft and SNR of my model with that of Schreier toolbox for a 1st order modulator with OSR=32 and for the same inputs, I see that the results are different. I have 28.5 dB SND and Schreier toolbox has 41.6 dB SNR.

Could you please help me figure out where is my mistake and why I get this poor SNR?

Thanks a lot.