Tool/software:
Hello,
My customer simulated Decimate-by-4 Composite Response (Figure 6-11 in the datasheet) by calculating Filter Coefficient CS40 x CS80 at Matlab.
The results are as left side below. (right side below is Figure 6-11)
Here, some differences at stop band compered to Figure 6-11.
At Figure 6-11, attenuation is <-70dB, but at their simulation it is >60dB, so more than 10dB differences.
And plot shape at the stop band look a bit different between their Matlab simulation and Figure 6-11.
Figure 6-11 is really correct? Or CS40 and CS80 filter coefficients are really correct?
Best regards,
K.Hirano
