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Third-Order Intermodulation Distortion
 
(IM3) Intermodulation distortion (IM) consists of the spurious signals which result from the mixing of nth order frequencies in the non-linear elements of a component. Third order intermodulation distortion is of particular interest because third order products typically represent the highest level distortion appearing close to the desired signal, and as such the highest level non-filterable distortion. Third order IM level (IM3) is tested by injecting two pure tones of equal magnitude (f1 and f2) into the component to be tested. The third order IM products will appear in the output spectrum at the frequencies 2f1-f2 and 2f2-f1. These products are characterized by defining their level (in dBc) relative to the fundamental output tones at either f1 or f2.

For a mixer, two-tone third-order intermodulation distortion products are described by (2fR2-fR1) + fLO and (2fR1-fR2) + fLO. The higher the third-order intercept point and conversion compression points of a mixer, the lower will be the intermodulation for given input signal levels.

See also Third Order Intercept Point

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this page last updated: 1 October 1999