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User:Khadm/My pictures

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In this figure both input frequencies are identical, but the phase variance between them creates the shape of an ellipse.
Top: Input signal as a function of time, Middle: Output signal as a function of time. Bottom: resulting Lissajous curve when output is plotted as a function of the input. In this particular example, because the output is 90 degrees out of phase from the input, the Lissajous curve is a circle.