What Is Intermodulation (IM3)? Third-Order Products, IP3 and How to Avoid It
Intermodulation is the interference created when two or more signals mix in a non-linear device and produce new signals at the sums and differences of their frequencies. The third-order products at 2f1 minus f2 and 2f2 minus f1 fall closest to the carriers and are the usual troublemakers. This guide explains active and passive intermodulation, where the products land, the third-order intercept point IP3 and the 3 to 1 rule, a worked multi carrier example, and the filtering, isolation and frequency planning that keep IM off a site.
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