fo free running frequency
k sensitivity usually Hz/V
Vc Control Voltage
When there isn't Vc (Vc=0), then the output of the VCO is fo.
if you need a frequency variation of 120kHz for a variation of 3 volts, then you need a k = 40kHz/v.
Freq Range, PhaseNoise, Sensitivity, Supply Pushing, Load Pulling, Output power etc are some important specs. If you are using Cadence suite, cdsdoc has info on testbenches for simulating oscillator
Freq Range, PhaseNoise, Sensitivity, Supply Pushing, Load Pulling, Output power etc are some important specs. If you are using Cadence suite, cdsdoc has info on testbenches for simulating oscillator
sweep your supply voltage by +/- 10% and with all other parameters fixed and see how the output frequency varies. The slope of the plot of the freq vs supply voltage gives Supply pushing