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Incremental Delta Sigma in MATLAB Simulink

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karthikchanda

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View attachment CIFF.rarHi All,

I am studying the working of Delta Sigma(DS) and Incremental Delta Sigma ADCs. I am trying to implement those in Simulink. For DS I am getting proper output with noise shaping and good SNR. But when I am using the same structure for IDS with the reset connected to integrator, I am getting third and fifth harmonics in the spectrum which are with in my band width. So my SNR is degrading. The only change I did from DS to IDS is reset to integrators. Please some one help me i understanding the problem. Is it that my structure is wrong for IDS or The way I am resetting the integrator is wrong or any coefficients in the CIFF structure are wrong. I am attaching my simulink file. Help me in handling the harmonics. Suggest any book/materials for Incremental DS

Thanks
 

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