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Altera_Forum
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13 years ago

about vhdl code for cic interpolation filter

i am attaching one pdf file based on cic filter.In the bitgrowth section the author has mentioned about the increase in the bits at the output stage .Suppose if i am writing a vhdl code for cic inter...
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Altera_Forum
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13 years ago

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After further work it turned out that my last statement needs correction.

The best thing is run this matlab program and read (d):

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The quoted paper doesn't explain the bit growth exactly, neither for decimation nor interpolation filters. Besides the Matlab tool, I would always refer to the original Hogenauer paper introducing CIC filters. Bit growth in the comb section of interploation filters is in fact simple, one bit per stage.