vector signal generator

A vector signal generator can support almost all types of modulations (analog or digital).

Hi

I want to test a polar transmitter, EER PA.
What kind of signal generator should I use and how can I synchronize the envelope path with the phase phase ?

Thanks.

Best Regards,
whlinfei

This is a good option for polar modulation development:

http://www2.rohde-schwarz.com/file_5086/1GP58_0E.pdf