Which terminal is connected to the VCO output in LC-VCO?

hi

I want to simulate the Pushing .
first, I sweep the VDD from 1.7 to 1.9 ,then use the frequency func in calculator.
the value is about 50M/v.
then I sweep the PSS, the value is about 3M/v.
why? which is correct?

another question:
the PDK provide the MOS varactor Model. D and S are connected together,G is another terminal. IN the LC-VCO, which terminal is connected to the VCO output?
which terminal is connected to turning voltgae ?why?

Thanks

little bit clear your question

LC vco using which var

gate terminal is connected tothe output of the vco