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.
Where ft1 and ft2 are the frequencies of two different inputs signals to the system.
Variable n can have any integer value.
Solving the above equation for n=2 will results in terms with frequency.