How should I improve my circuit for squaring waveform input?

[elonjia]

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?

 

[FvM]

By nature of bandpass filter, if the input waveform is a square wave, the output waveform will be different. Not clear what you want to achieve.

 

[elonjia]

By nature of bandpass filter, if the input waveform is a square wave, the output waveform will be different. Not clear what you want to achieve.

So it's good in terms of the waveform? I want to output to be the square waveform either, should I increase the bandwidth?

 

[FvM]

Why are you using a filter at all?

 

[elonjia]

are you using a filter at all

Just want to use a cap-based amplifier, should I increase the BW? Because I want to let the circuit work on 1MHz and without too much noise

 

[barry]

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.

 

[elonjia]

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?