How i can generate sigma delta modulator in simulink?

can you help me to generate first order sigma delta modulator in simulink with (256 OSR) to define:

-SNR of the modulator (using FFT)

-check from the design the shows noise shaping

Answer 1

[Sivsankar]

Hi Anas,

You can leverage the following file exchange file and investigate if the model from this file resolves your query:

https://www.mathworks.com/matlabcentral/fileexchange/47176-simulink-sigma-delta-toolbox?s_tid=srchtitle_support_results_5_1-1%20MASH

The Delta Sigma Modulator block present in Simulink helps you to predict SNR but as of R2024a, it does not provide that functionality for 1st order Delta Sigma Modulator. This block only works for modulators from 2nd order to 6th order. You can refer the documentation for that block here:

https://www.mathworks.com/help/msblks/ref/deltasigmamodulator.html#mw_32ef6a46-93fa-436a-97e3-01de8cd1b7df

I hope this helps!

Thanks.