IMD3

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IMD3 refers to the intermodulation distortion from the third harmonic of a circuit. It is of particular importance in narrow band signals because its distortion is often in the signal band. This can be seen by looking at a signal that is made up of two sine waves, one at f1 and one at f2. When you cube the sum of these sine waves you will get sine waves at various frequencies including 2\times f_2-f_1 and 2\times f_1-f_2. If f1 and f2 are large but very close together then 2\times f_2-f_1 and 2\times f_1-f_2 will be very close to f1 and f2.


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