How to measure mixer iip3 using the QPSS and QPAC in SpectreRF?

i am measuring the iip3 of the mixer using the anlayses QPSS and QPAC in spectreRF.

for plotting the IPN curves, (say iip3) how to choose the 3rd order harmonic and 1st order harmonic?

check this appnote by cadence it may help

http://www.ecse.rpi.edu/Courses/F05/...Mixer533AN.pdf

khouly