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I implement a filter with the following parameters:

taps = 20;
data_wigth = 10;
filter_wigth = 10;
interpolation_factor = 4;

I have found that

output: out std_logic_vector( ( M * data_width + filter_width+ log2(taps)- 1) downto 0) 

Why is log2(taps)?

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1 Answer 1

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You are summing the outputs of the taps, so to avoid overflow the word length grows as ceil (log2 of the number of taps).

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