Design of Flat-roofed Narrow Band Pass Filter
LU Yong-kang · Electrical Measurement & Instrumentation · 2009
In order to fulfill the need of frequency domain test in geophysical exploration,with numerical method,the relationship can be obtained between all-levels central frequency and Q value when the two stage cascade filter is critical for offset,according to which,a flattened narrow-belt band pass filter is designed.And the test result indicates that its characteristics are consistent with theoretical calculating curve.Besides,the selectivity,sensitivity,the width of flat-top and Low-Noise bandwidth of the circuit are discussed.And the suggestion of designing a notch filter of 50Hz power frequency by using this circuit comes as a conclusion.。