IMD3

Encyclopedia : I : IM : IMD : 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 [f_1] and one at [f_2]. 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 [f_1] and [f_2] 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 [f_1] and [f_2].

 

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