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ADF4351 VCO Output Phase Noise

Question asked by jsuss on Nov 20, 2015
Latest reply on Nov 20, 2015 by rbrennan

I am trying to characterize the phase noise of the VCO output of the ADF4351 eval board. There are values that I care about that do not have plots given for them in the datasheet. How should I go about this problem?


Currently I have detached the resistor connected to VTUNE and have hooked up a power supply to VTUNE and GND to manually tune the VCO to the values I am interested in. Looking at this plot from the datasheet:


I am unable to move/tune the VCO to move out of the first band. Is this something that I need to change in software? Or should I be approaching this problem differently?