How to make the bandpass filter stable?

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creative
creative el 3 de Jun. de 2020
Hello,
I am designing a multiple feedback bandpass filter but i get a bode plot which shows its unstable. I have attached the bode plot below, Could anyone share your opinion how to make it stable or my analysis is wrong?
Code:
Reference for designing BandPass Filter: http://www.ecircuitcenter.com/Circuits/MFB_bandpass/MFB_bandpass.htm
Thank you.

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