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The frequency of the noise voltage source should be several kHz, right? The VCO works at 10GHzSimple..
Connect a ideal Voltage Source to Vtune and do a PSS-PNOISE analysis then Connect a Vnoise in series to this Ideal Voltage Source ( or attribute a Noise Voltage value in related field) then do the same simulation then compare these two results.You will find the "sensitivity" of the VCO against Noise Contribution.
You can also add/subtract Noise Voltage Source to Vcc to find Supply Sensitivity of the VCO.
Noise Voltage is independent from frequency.You will just add some noise value, that's it.The frequency of the noise voltage source should be several kHz, right? The VCO works at 10GHz