Re CIC gain, there's a also a decimation specific shifter involved in
the path. Please take a look at
Yes. You guys have the R^4 formula right, but the shifter takes back
most of the gain. The actual gain from the CIC decimator once you
include the shifter is:
R^4 / ( 2^ ceiling(log2(r^4)))
I hope that is readable. Basically, if R is a power of 2, then the gain
is exactly 1. If R is not a power of 2 then the gain is in the range of
(0.5,1).
Matt
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