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Notch filter using KHN biquad filter

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CaptainSpock

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Hi
Would like to ask if I can implement a notch filter using a KHN biquad filter (state variable), something like this https://tera.yonsei.ac.kr/class/2006_1/lecture/Lect%2016%20Two-Integrator-Loop%20Biquad.pdf, at page 8. Meaning this would use 4 op-amps right? And what would the formula for the centre frequency be?

I'm actually designing a filter to eliminate 50hz ambient noise from a pulse oximeter system, open to any suggestions =)

Thank you.
 

LvW

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As written in the paper you have to use a 4th opamp to sum all 3 outputs.
As the formulas show the center frequency is wo=1/RC.
 
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