HMC954 operation voltage

Hi,

The default use case of HMC954 is 0V(GND) at the high supply rail and -3.3V at the low supply rail (VEE). If you have -3.3V on your design, you may use the part as is.

Alternatively, you may supply the part with all supplies and pins shifted by +3.3V as well. 

GND pins will be connected to +3.3V, RF input and output will be referenced to +3.3V with internal 50ohms. VR voltage needs to be shifted by +3.3V as well. You'd still need an AC connection from +3.3V (gnd pins) to the PCB RF ground which is achieved by additional by pass capacitors. In the end of the day, you dont use -3.3V supply but +3.3V supply with additional passive components. 

I'd recommend you to stick to GND and -3.3V usage as much as possible to get the performance shared in the datasheet.