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NOTCH_FILTER_CIRCUIT

2017-02-11 16:30  
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NOTCH_FILTER_CIRCUIT
This circuit is basically a noninverting amplifier with positive feedback. The negative feedback path is set to unity by a direct connection between the output terminal of the operational amplifier and the inverting (-) input. A frequency-selective RC network connects the output to the noninverting (+) input, providing some positive feedback. The center frequency is FC=1/2πR1(C1C2)1/2where FC is the center frequency in hertz, R1 is in ohms, and C1 and C2 are in farads.