It looks like the AD9957 needs four power supplies. So the digital and analog rails are split and there is a pair for 3.3V and pair for 1.8V.
Usual solution is to use single dual regulator with bunch of T filters. Like this guy who made a DAB radio transmitter using this same chip. But it would seem the current requirement is bit weird so this power scheme is not very good option
So after spending some time i think i will start with 150 mA dual regulator (tested in old design) with only one T filter, and use extra 700 mA regulator for the demanding 1.8V DVDD.
Anyway, both could be switched off via Inhibit pin, so the quadrature upconveter could be off if not needed in RX mode and save more than 800 mA. There is also a need to complete the signal part of the module, to follow…