--- Quote Start ---
I & FvM checked that already. There was typing error in your first doc which I corrected as -i+1 addition then FvM told us that Hogenauer's equation was mistyped as 2N-1 instead of 2N - i which is equivalent to what I did. Anyway I corrected te matlab code - see my last version and it does agree with your figures.
So I am more inclined to think you are doing something wrong rather than Hogenauer or Donadio or FvM are wrong. Can you post your matlab code so we get the culprit.
--- Quote End ---
here is the matlab code that you wanted to see
Bin = 24;
%input width
N = 9;
%stages of comb or integrator
M = 1;
%differential delay
R = 8;
%interpolation rate
%cic decimator at any stage
Bout = N * log2(R*M) + Bin;
%cic interpolator per ith stage
%stages 1~N
for i = 1:N
G = 2^i;
Bout = Bin + log2(G);
d(i) = Bout;
end
%N+1 ~ 2N stages
for i = N+1:N*2
G = 2^(2*N-1)*(R*M)^(i-N)/R;
Bout = Bin + log2(G) - i + 1;
d(i) = Bout;
end
for
i = 1:N*2
fprintf(
'%i %i\r',i,d(i));
end
and the output for bout is
1 25
2 26
3 27
4 28
5 29
6 30
7 31
8 32
9 33
10 32
11 34
12 36
13 38
14 40
15 42
16 44
17 46
18 48
Honored Contributor
