Forum: Analog Circuits Bandpass Filter

von Walid W. (w2016x)

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I'm having a difficult time figuring out how the attached bandpass 
filter works - what sets F0, Q and Gain. I think the two lower opamps 
centered at Vcc/2 are acting as integrators but I'm baffled by how the 
feedback is applied to set the filter's parameters. Thanks!

von Lutz vW (Guest)

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It is the popular KHN-topology with two inverting MILLER integrators. 
The output of one integrator is fed back to the pos. input of the gain 
stage, and the other outputis connected to the inverting opamp input.
Recommendation: Google for KHN filter (Kerwin-Huelsman-Newcomb).


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