SNR Degradation due to CIC Filter

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Eminent.Engineer

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Hello Everyone,

Delta Sigma ADC:
Modulator = 2nd Order
CIC Filter = 3rd Order
OSR = 256

CIC is hardware efficient Decimation Filter but its frequency response shows passband droop and wide transition band, so my question is due to these non-idealities of CIC filter, How much degradation in SNR occur and theory about estimating this degradation ?

Thanks in Advance.
 

I see two ways to downgrade SNR with unsuitable designed decimation:
- bit width too low (generating quantization noise)
- alias frequency suppression too low (insuffcient filter order related to the application)

With correct designed decimation, there's no significant SNR degradation
 
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