Active Narrowband Filter Circuit

Published:2011/7/11 3:01:00 Author:Joyce | Keyword: Active , Narrowband , Filter | From:SeekIC

The filter uses LC as feedback impedance of the operational amplifier. The circuit is simple and convenient to debug, and it has the good frequency-selecting performance. Signal gain of the circuit is ZF／R1,and the frequency of the maximum gain point is decided by LC , the amount of which being : The feedback impedance maximizes and is approximate to RF on the resonance point of LC, so at that time, the circuit has the largest gain. But, it will be influenced by the quality factor of no-load of inductance coil.



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