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ADAU1772 Filter Response Issues

Question asked by ykanybb on Feb 24, 2016
Latest reply on Feb 29, 2016 by joe42

I designed a 8th-order filter in Matlab and transform it into the SigmaStudio.In order to get the 8th-order filter I use four 2nd-order filter as follows.

 

ADI1.png

 

The response of filter get from the Probe have a strange shift campare with the desired response designed in Matlab.The response of magnitude  raise up and the phase drop down below 100Hz in sigmastudio.

 

Matlab.png

                                                                            Matlab

 

ADI.png

 

                                                                       SigmaStudio

 

Who can tell me the reason of the change in SigmaStudio.Thanks a lot.

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