Recently I've been reading articles about RF converters and have two questions to the parameters.
1. IIP3 or OIP3
Is it correct, that for upconverters OIP3 is critical and for downconverters IIP3 is critical?
2. 1dB Compresssion
I have seen a -6dB for a converter and a +5dB for another converter. Should this compression be positive or negative? Or it depends on if it is an upconverter or a downconverter?