According with Ali Hajimiri et al. (e.g. in "Concepts and Methods in Optimization of Integrated LC VCOs"), you can fix trade-offs VCO LC based on varactor value (Cv), channel width (Wn), current consumption (I), and inductor.

But, I donīt understand how all these variables are mathematically related each other, througth simple expresions (pre-simulation). (I guess that article's expressions are not enough).

If anybody knows about I'm meaning, please, help me understand such "mistery".