Re: Linearity in Mixer..?
6 dB is very low noise figure !!!
As I understand you are using input matching, this adds roughly 3 dB to NF, then your unmatched noise is 3 dB ???
I believe something is missing here...
NF settings : Change RF port into DC.
Remove input match, keep Rs of port 50Ω
For PSS , zero harmonics.
For PNosie, ref sideband = -1, and use good number of
harmonics 10-20
For linearity, try 1dB compression, it's always faster than two tone, if you still have no convergence use qpss "Just same as pss with less aquricy.