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2nd order butterworth MFB active filter design

Other Parts Discussed in Thread: OPA377, OPA735, OPA378, OPA2374, TLV9062, TSV912

We are developing  2nd order butterworth MFB active filter for PWM signal filtering.  In the process we are referring to your technical material  MFB 2nd order Single supply sboa231. According to this app notes the values we are getting is different when calculated using filter tool.   We need  to develop a filter with gain of 1 and Fc of 20kHz.

We have attached the Link below for you reference.

The corresponding values when calculated based on the app notes is as follows :=

R1=R2=R3=10k, C1=1nf C2=4.02nF.

Please help us to reconcile these values. ALso suggest which values to consider for optimum performance.