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High Q value trapped wave filter circuit

2017-02-27 10:19  
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High Q value trapped wave filter circuit
The high Q value trapped wave filter circuit is as shown in the figure. Because the double-T network filter can have the better attenuation characteristics only when it is far away from the resonance frequency f0, so the Q value of the filter is not high. If the output signal of the filter is output by the voltage output device (the gain is 1), and it is feedback to the double-T network to form the bootstrap, so when the input signal attenuates for 0.3, the Q value is more than 50. The voltage follower is composed of the op-amp, the potentiometer R4 can continuously change the Q value of the circuit (from 0.3 to 50), the trapped wave frequency f0=1/2πR1C1.