- The supply voltage
- The bias current
- The frequncy of oscillations
- The inductance of the inductor
- The tank resistance
If we increase the bias current of the VCO the amplitude will increase in direct proportion until the voltage will reach Vlimit.
Vout = Ibias * Rtank
This regime is called the Current Limited Regime.
Now if we keep increasing the bias current the VCO, the output swing will keep Vlimit (with a small change).
Vout = Vlimit
This regime is called the Voltage Limited Regime.