The datasheet for ADRF6602 claims that IIP3 of the mixer is +30dBm but absolute maximum rating section tells the maximum RF IN for the ixer is +16 dBm. how is it possible? how can be IIP3 greater than maximum allowable RF IN power?
IP2/3 are calculated intercept points points based off of extrapolations of the fundamental tones, 2nd order products and 3 order products - the device never really reaches the IP2/3 points because it compresses at a much lower power level.
Here is a plot from RFcafe.com that shows this behavior pretty well:
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