Intercept point and undesired responses

A method for using the concept of intercept point to calculate the undesired-response rejection ratio of a single stage is presented. Single stages may be cascaded together to form a system and the undesired-response rejection ratio of the system may be found using a procedure similar to cascaded noise figure. When applied to receiver system design, this method allows easy calculation of such undesired receiver responses as intermodulation distortion and spurious responses.