looking for a phase shifter (500MHz, 360°)

Hi:

   I'm looking for a digital phase shifter with a bandwidth of DC-1 GHz for a 360° phase shift.

I saw that your company has a vector modulator ADL5390, which can be used as a phase shifter.

How does it work? Is the phase fixed depending on the input VQBB and VIBB or can it be changed? What are the VQBB and VIBB provided by?

Kindly help

Yimei Zhou