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2nd order anti aliasing filter combined with correction table instead of 8th order one

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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


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