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Re: gain scaling of comb filter

Started by wuqi...@yahoo.cn May 20, 2009
Hi, have you get your answer? I am a beginner of this field. I am in a project that have to use the CIC filter. The gain of the filter also puzzle me a lot. In matlab, I could just divide by 1/gain(CIC) before or after the CIC to scale the gain of this filter to 0 dB. But I don't know how to implement it in verilog or in the hardware. Also I don't know whether is it necessary.
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> Hi everyone,
>I have a 3rd order CIC comb filter with decimation ratio of 16. The
>freq response of the filter shows a gain of 60 dB. How do I scale
>the gain of this filter to 0 dB? Do I minus 1000 from each of the
>coefficients of the filter, Hz?
>One of the paper I read uses a power of two scaling prior to data
>entering the filter. Can somebody explain what is that mean?
>Thank you,
>EngGan
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