You can power ADL5611 with a switching DCDC converter. We have not tested ADL5611`s PSRR performance, so there will be switching spur leakage on the RF output spectrum. If those are within your requirements, then you are good to go.
To generate datasheet plots, we have also used benchtop PSU`s, which are essentially switching based supplies.
I moved your question on the ADL5611 to the RF and Microwave community. Someone here should be able to assist you.
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