Circuit simulation problem: as the chart, the signal into a square wave, after a comparator recuperated into resonator, filter out interference,

The problem is that the signal through the op-amp, really become a square wave, and the signals and the signals produced by the waveform generator is the same, as shown in figure:

But, after a resonator, waveform generator output of signals, and the op-amp signal output, as shown in figure:



Device model as shown in figure, the simulator version for Multisim14.2

Why is this? Signal amplitude and phase are the same, why the results will be different?

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The circuit connected? The op-amp output circuit have not heard from input?

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reference 1/f, the wise know already should good karma response:

circuit connected? The op-amp output circuit have not heard from input?

Then good, now resonance is part of the input signal generator to generate signals (as shown in figure 1), this is normal, the corresponding waveform on the third figure from top to bottom).
If the resonant part of input to output of the op-amp (FIG. 1 is not said, but the actual changed), the corresponding waveform is the fourth figure

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reference 4 floor wise men know already should good karma response:

whether injustice problem? !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Thank you for your answer,
I replaced a power supply and ground, the result is still the same:

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reference 3 floor wise men know already should good karma response:

You this simulation result, the output of the resonator, one cycle of the output, there are two output Zhou Bocai, why is this? Should not be a normal cycle is the output?

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