I am now designing a narrow bandpass filter. Requirements are shown below:
Center frequency is about 2kHz(10% flutuation is OK). The gain of center frequency is about 34dB(the higher the better,up to 65dB). The difference of gain between 2kHz signal and 1kHz signal(or half of the center frequency) needs to be not less than 43dB.
My current design is to use the MFB topology to build up a two-stage/four-order bandpass filter.
Is such design OK? Or any other better topology or method?
Addition: The simulation result is
Center frequency at 1.999kHz; Gain@2kHz is 34dB; Gain@1kHz is -12dB; The phase margin of each stage is higher than 45 degree(test by middlebrook method)