Question: Suppose the VCO of Fig. 8.25(a) employs varactors whose capacitance is given by Cvar = C0(1 + α1V + α2V2), where V denotes the gate-source voltage. Assume complete current steering and a low-frequency noise current of In 5 Im cos ωmt in ISS.
(a) Determine the AM noise resulting from In.
(b) Determine how the average value of the varactor capacitance varies with In.
(c) Compute the phase modulation as a result of the tank resonance frequency modulation.
