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Hello everyone,

I am designing an Analog Front-End for biosignals (EMGs). You can find the corresponding circuit here /g/LTspice/files/EMG_AFE.asc. I have selected INA317 as an instrumentation amplifier and I am trying to design a 2nd order low pass filter after the InAmp stage. The problem is at Capacitor C3. If I remove the capacitor and connect the path to ground, the circuit behavior is not as expected. However the classic Sallen Key circuit topology does not contain this capacitor. Should someone has any idea why is it necessary in this particular configuration with the INA317, I would be very grateful.

Thank you in advance.?

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