An LC voltage-controlled oscillator with supply sensitivity compensation method

The mechanism by which the frequency of an LC VCO is sensitive to the power supply is analyzed. It is shown that variations in both the common-mode and differential-mode components can give rise to periodic jitter in the presence of supply variations due to capacitive nonlinearities. A new compensation method that reduces this sensitivity is presented. Simulations are shown verifying that this method can reduce the periodic jitter by more than 80%.