Dear All,
Please suppose we want to design an anti aliasing filter with the bellow parameters:
signal bandwidth= 1 kHz
error at 1 kHz= less than 1 %
sampling rate= 11 kHz
A/D resolution= 16 bits; -98.08 dB attenuation at 5.5 kHz
We can design a 8th order Butterworth with FilterPro.
Is it possible to use a 2nd order filter combined with a correction table in the firmware instead of the 8th order?
explanation: the attenuation of 2nd order at 1 kHz is greater than 90 % which would be corrected with a table in the firmware.
Regards, Ras