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_HIGH_Q_NOTCH_FILTER

2017-02-20 13:53  
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_HIGH_Q_NOTCH_FILTER
_HIGH_Q_NOTCH_FILTER
_HIGH_Q_NOTCH_FILTER
This circuit shows a twin-T network connected to an LM102 to form a high-Q, 60-Hz notch filter. The junction of R3 and C3 which is normally connected to ground, is bootstrapped to the output of the follower.Because the output of the follower is a very low impedance, neither the depth nor the frequency of the notch change ; however, the Q is raised in proportion to the amount of signal fed back to R3 and C3. Shown is the response of a normal twin-T and the response with the follower added.