Evaluating broadband RF mixer?

[fenfei]

There are many broadband RF mixer MMIC , But their datasheet always give characteristic under specific condition, typical a narrow band application. How to evaluate the performance under broadband condition? Or what margin should be when design broadband RF converting link?
For example ,IF a mixer’s IIP3 is 20dBm at 900MHz RFin, 70MHz IF out, what IIP3 could be expect at 0.1~3GHz RFin, and 70MHz IFout?

 

[tony_lth]

Out of the mixer band, the IF output signal maybe have spurs so that you can't use it. It's not only the IP3 problem,

 

[elektr0]

May be the most modern answer to your question is: USE X-PARAMETERS !