
Bryant Sorensen (@bryant_s)
Reaching back a bit, but if I remember correctly, one of the beauties of CIC filters is that any overflow created in the accumulation (first) stage is exactly undone...
So, if 407.8 MHz is the 'zero bin', and you have a large negative value in dB at that point - isn't this what you want? You are putting a notch at that frequency...
Tony,Some clarification would help me. First - you say 'zero bin', but your X labels on the graphs show 405.5 to 410.0. ???Second - can you give the filter...
To more directly answer your first questions - you are experiencing idle tones. These are common in sigma-delta modulators, especially low orders. This is because...
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