I am trying to find the voltage gain of a certain ideal op amp circuit with a sinusoidal input. However, when I simulate the circuit, the output shown seems to be my calculated output but with a higher frequency wave superimposed on it. Why is this?
Update: The 5th harmonic has been mentioned in some answers. I may be wrong but as far as I know, a sine wave has 1 harmonic so shouldn't the output signal be the same frequency as the input signal?