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Altera_Forum
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10 years ago

Trouble with CIC filter

I'm trying to implement a CIC decimation filter( with R = 1000, M = 1 and N = 2 ) and Fs = 1 MHz without using the CIC IP core. Using matlab implementation I found out that the suppression of the CIC...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

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So that means I don't need the

-- delays

l_integrator_out_1 <= integrator_out_1;

l_integrator_out_2 <= integrator_out_2;

rather I only need

integrator_out_1 <= (l_data_in) + integrator_out_1; -- ( o/p of the 1st integrator )

integrator_out_2 <= integrator_out_1 + integrator_out_2; -- (o/p of the 2nd integrator feed into the input of a comb)

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yes just basic two cascaded accumulators.