Definition and Testing Method of IMD3

　　When two signal frequencies f1 and f2 or multiple signal frequencies pass through the same RF transmission system simultaneously, nonlinear frequency components are generated between the fundamental frequency signals due to the nonlinear effects of the transmission system. This phenomenon is called intermodulation or intermodulation. Nonlinear frequency components are referred to as intermodulation products. If these intermodulation products fall within the receiving frequency band and are strong enough, they will cause interference to the frequency of the fundamental signal, which is called passive intermodulation interference or passive intermodulation distortion.

　　The cross adjustment product is represented by the following formula:

　　f1m=mf1±nf2········

　　In the formula, f1 and f2 are the input fundamental frequency

　　F1m is the intermodulation frequency or intermodulation product

　　m. N is a positive integer including 1, and m+n is the order of intermodulation

　　Example: When m+n=3, it is a third-order intermodulation

　　Dynamic third-order intermodulation: testing the third-order intermodulation of components in a stationary state;

　　Static third-order intermodulation: Test the third-order intermodulation of the component in a shaking state.

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