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SNR degradation due to decimation filter in sigma-delta ADC

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gen0357

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Hi,

Currently I am working on 2nd order sigma-delta ADC consist of 3rd order sinc filter.

I would like to know how much SNR degradation may occur because of the decimation filter ( due to noise folding & non-ideal response of sinc filter). Especially in the case when over-sampling ratio is very high (OSR > 256).

Please let me know how can I estimate it?

Thanks.
 

Can't you look at the frequency response in Matlab. You've completely speced out the filter above (3rd order, D=256, CIC).
 

Re: SNR degradation due to decimation filter in sigma-delta

Thanks for the reply RBB.

I have already simulated in MATLAB and check the SNR. But I found significant degradation in SNR.

So I would like to know if any mathematical equation/theory is available to predict the in-band noise after decimation. Similar to the one we have in case of sigma-delta modulator to predict in-band quantization noise (temes book).


Thanks
 

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