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High Q Band-pass Filter Circuit

2017-02-26 22:15  
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High Q Band-pass Filter Circuit
As shown in the figure is a high Q bandpass filter circuit. This circuit uses two operational amplifiers SF356 with high input impedance, of which the first stage working as a common single-section filter, whose Q value is low, the value of R3 is smaller, attenuation value is larger, and the magnification factor is small. But the magnification factor of the second stage inverse proportional amplifier is 10 times .And it will reach the input end of the first grade through R2 to introduce a certain amount of positive feedback, thus improving the Q value of the whole circuit. Therefore the filter has good frequency-selecting feature.