Intermodulation (IM) distortion

Intermodulation distortion is a scenario where signals from outside the monitored channel combine nonlinearly to produce frequencies within monitored channel frequency range. This intermodulation distortion is a completely undesirable but un-avoidable scenario in RF.

Distortions in a system are represented with the help of Taylor series. Each term in Taylor series is represented as in formula below.

Intermodulation Products

Where ft1 and ft2 are the frequencies of two different inputs signals to the system. Variable n can have any integer value.

Lets discuss following Intermodulation products:-

Second Order Intermodulation products are discussed below.

Intermodulation Products

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M is a variable which takes the values 0,1 and 2

So we get, m = 0,

Second order distortion product =  Intermodulation Products

m = 1,

Second order distortion product = Intermodulation Products

m = 2,

Second order distortion product = Intermodulation Products

Access Third order Intermodulation products from here..

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