The circuit diagram of high Q notch filter

Published:2011/8/9 3:28:00 Author:Felicity | Keyword: high Q notch filter | From:SeekIC

This figure shows the circuit of high Q notch filter. The operational amplifier in the low figure comprise voltage follower. The potentiometer R4 can change the value of Q (from 0.3 to 50). And the notch frequency : f0=1/2πR1C1. To avoid the drifting of f0, silvering mica or carbonate capacitor and matallic film resistance are needed. To reach 60dB attenuation, the allowance of resistance is below 0.1% ,and the allowance of capacity is below. To make LM102 work steadily, a 0.01μF capacitor is needed to filter the power.



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