the circuit is just like a bandpass amplifier above, and when I input a square waveform, the output is just like the yellow curve; how should I fix this?
The whole point of a bandpass filter is to attenuate low and high frequencies. There's no way you can expect fast edges AND attenuated high frequencies. Fast edges=high frequency.
The whole point of a bandpass filter is to attenuate low and high frequencies. There's no way you can expect fast edges AND attenuated high frequencies. Fast edges=high frequency.
Thanks, could I move this high f to a higher freq so it has a better output performance? Also, is there any recommendation for the high-frequency circuit structure?