Accurate PLL Characterization Using Virtuoso Spectre RF Noise ...

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Non-linear VCO PPV Model
•
•
α(t) is the phase deviation due to perturbation of the VCO and
satisfies the nonlinear differential equation.
Owing to the PPV, νT 1(t),
oscillator phase deviations due to
perturbations can be efficiently evaluated by solving the one–
dimensional nonlinear differential equation (1).
The PPV relates the changes in the circuit’s nodes voltages or
currents to the VCO phase.
September 17, 2007
•
α
() t v n()
t
T
= ∗
1
(10)