Q and Frequency Adjustable Narrow Band Filter (741)

Published:2011/8/10 7:38:00 Author:Felicity | Keyword: Q and Frequency Adjustable, Narrow Band Filter | From:SeekIC

The circuit is an active Q and frequency adjustable narrow band filter. It adopts the form of Wien bridge positive feedback ,but the loop gain is under 1.The character of this circuit is that adjusting Q has no effect on center frequency, because Q only depends on the gain of the circuit.When the gain is 600,Q is 2000; and when the gain is 140,Q is 30. And in the ordinary Wien bridge oscillator, for non-inverting terminal, the gain of the amplifier must above 3 to oscillate, but in this circuit the gain of the amplifier is below 3.



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