As the title suggests, I have done all the necessary calculations to implement a gain into my second order stage of my 6th order high pass filter but for some odd reason, it would change the amplitude response of the circuit. I have recalculated the resistance that affect the filter by implementing K into their equations and I cross checked it with analog.com which proved that it was spot on so Im not really sure on why the response changes hence changing the cut-off frequency.
The difference in the cut-off frequency is huge, the original design is at 100Hz whilst the gain version reduces it to 180Hz.
The schematic without the gain:
The schematic with a gain:
And also if someone could explain why resistance of 150kOhms and above only work with the gain of the amplifier that would be appreciated!