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  1. #1
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    about cic filters advantages of integrating and combing at lower sampling rates

    what are the advantages of integrating at higher sampling rate and for comb filters lower sampling rate in cic filters

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  2. #2
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    Re: about cic filters advantages of integrating and combing at lower sampling rates

    Since Z-domain transfer function of CIC filter is:

    where
    N=order of filter
    M=Differential Delay (usually M=1 or 2)
    R=Decimation Factor

    So while implementing CIC as decimation filter Integrator is followed by Down Sampler and then by Comb filters, the advantage is that now you need only "M" delay elements as compared to "M*R" required for earlier implementations which results in less area and low power consumption. As shown in following figure: (Note: M=1 in figure)
    Click image for larger version. 

Name:	Multirate_Trans_Func_figure1.PNG 
Views:	6 
Size:	8.6 KB 
ID:	81204
    Hope this is helpful.



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  3. #3
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    Re: about cic filters advantages of integrating and combing at lower sampling rates

    Quote Originally Posted by Eminent.Engineer View Post
    Since Z-domain transfer function of CIC filter is:

    where
    N=order of filter
    M=Differential Delay (usually M=1 or 2)
    R=Decimation Factor

    So while implementing CIC as decimation filter Integrator is followed by Down Sampler and then by Comb filters, the advantage is that now you need only "M" delay elements as compared to "M*R" required for earlier implementations which results in less area and low power consumption. As shown in following figure: (Note: M=1 in figure)
    Click image for larger version. 

Name:	Multirate_Trans_Func_figure1.PNG 
Views:	6 
Size:	8.6 KB 
ID:	81204
    Hope this is helpful.
    actually i want to ask you a question that what is the difference between differential delay and ordinary delay.this differential delay M=1 or 2.



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