Provided you have a signal source at the input of a stage, and point the Rapid IP3 form at the output of a stage, then you should be able to measure it. In practice this may mean you have to have a separate testbench for each stage of your "lineup" (not sure what you mean by "lineup" - I'm assuming you mean your receiver chain?). Note that if the circuit is not translating in frequency (i.e. there's no LO, becauseOriginally posted in cdnusers.org by adbeckett
it's not a mixer), you may want to use RapidIP3 from the "ac" analysis form rather than "pac".