Patent ID: 7894788

Claim:
A RF section of a receiver comprising: a) a first RF circuit for down converting and digitizing a first RF signal received at a first RF signal input terminal and providing a first digitized down-converted signal coupled to a first output terminal; b) a second RF circuit for down converting and digitizing a second RF signal received at a second RF signal input terminal and providing a second digitized down-converted signal coupled to a second output terminal; c) said second RF circuit further comprising: i) an analysis bank that receives and decomposes said second digitized down-converted signal into a plurality of digitized signals having a like plurality of frequency bands to form a like plurality of narrow bandwidth signals; ii) a signal characteristic detection circuit which receives each of said narrow bandwidth signals and provides a group of selected narrow bandwidth signals which contribute to third order harmonic interference (IM3) products of sufficient magnitude to warrant attenuating said IM3 products in said first digitized down-converted signal; iii) a synthesis bank that receives and combines said selected narrow bandwidth signals to form an equivalent IM3 producer signal; and iv) an adaptive lookup table programmed with a model of the equivalent composite nonlinearity of said first RF circuit that receives said IM3 producer signal and provides an IM3 compensation signal at said second output terminal; and d) a combining circuit which combines signals at said first output terminal and said second output terminal to produce a down converted and digitized RF signal which has IM3 products attenuated compared to said first digitized down-converted signal.