In the experiment 6 for BPF, the input to the CR circuit op-amp is square wave, what is the output of this op-amp looks like

In the experiment 6 for Band Pass Filter (BPF), if the input to the Capacitor-Resistor (CR) circuit operational amplifier (op-amp) is a square wave, the output of this op-amp would look like a band-pass filtered version of the square wave.

Here are the steps to understand this:

1. A square wave is a non-sinusoidal periodic waveform (which can be represented as an infinite summation of sinusoidal waves), and it contains a wide range of harmonics.

2. When this square wave is fed into the CR circuit of an op-amp configured as a Band Pass Filter (BPF), the BPF allows only a certain range of frequencies to pass through and attenuates the frequencies outside this range.

3. The output will therefore be a distorted version of the square wave - it will look like a square wave but with its higher frequency components removed. This is because the BPF allows only the fundamental frequency of the square wave and its close harmonics to pass through, and filters out the rest.

4. The exact shape of the output wave will depend on the specific cut-off frequencies of the BPF. If the BPF is designed such that it allows most of the harmonics of the square wave to pass through, the output will look more like the original square wave. If the BPF attenuates most of the harmonics, the output will look more like a sine wave.

5. To see the exact output, you would need to use an oscilloscope. The oscilloscope will show you the time-domain representation of the output signal, which will give you a good idea of what the filtered square wave looks like.

Remember, the output will not be a perfect square wave due to the filtering action of the BPF.