using Arbitrary Waveform generator for I/Q modulator

I need to know, can i use arbitrary waveform generator, in place of RF signal generator for I/Q modulator testing?

You need an IQ modulator.
Some Arb Generators have direct IQ output.
http://www2.tek.com/cmswpt/psdetails...ci=14055&lc=EN
http://www2.rohde-schwarz.com/file_5495/1gp45_1e.pdf