Thanks for the help,
Another question:
Can an Image Rejection Mixer also be used as an Single Sideband Upconverter if there are no filters and the frequency ranges are right ?
Also, if I have a situation like this:
I want to downconvert a signal from RF = 20 GHz to IF = 1 GHz. The LO is supposed to be at 21 GHz. I am certain that the only signal coming from the RF port is 20 GHz, but the LO signal might also be present at 19 GHz. Is this a problem as both with downconvert to 1 GHz ?