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CIC Filter Length #2
I am reading about CIC filters used for an Sigma Delta converter. In that
the author mentions that
- For a 2nd order filter, decimating by N, the length of the impulse
response is 2N+1
- For a 3rd order filter, decimating by N, the length of the impulse
response is 3N.
- For a 4th order filter, decimating by N, the length of the impulse
response is 4N.
The filter has to operate for a min number of cycles at least equal to the
length of the impulse response.
Can somebody explain how he is defining the length of the impulse response
here?
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Reply
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 analog_fever
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8/5/2010 9:29:46 PM |
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On Thu, 05 Aug 2010 16:29:46 -0500, "analog_fever"
<usu_vlsi@n_o_s_p_a_m.yahoo.com> wrote:
>I am reading about CIC filters used for an Sigma Delta converter. In that
>the author mentions that
>
>- For a 2nd order filter, decimating by N, the length of the impulse
>response is 2N+1
>
>- For a 3rd order filter, decimating by N, the length of the impulse
>response is 3N.
>
>- For a 4th order filter, decimating by N, the length of the impulse
>response is 4N.
>
>The filter has to operate for a min number of cycles at least equal to the
>length of the impulse response.
>
>Can somebody explain how he is defining the length of the impulse response
>here?
Hello analog_fever,
I think the impulse response length of a
CIC filter is:
Imp. Resp. length = M(N-1) + 1
where M is the order of the filter.
You should be able, without too much trouble, to
check this using some software.
Goos Luck,
[-Rick-]
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Rick
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8/7/2010 12:08:19 PM
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