Hi Vivek,
I calculated that a 10 pF MIM cap has about 150 fF of bottom plate capacitance (metal 5 to substrate). Does this number seem reasonable? Anyway if i could suppress that 150 fF, my resonant frequency would be closer to what I want.
The problem is that the inductor models that I have aren't scalable, and the circuit resonates slightly below the desired frequency, so rather than make a huge change in the inductance, i wanted to see if i could get rid of some of the parasitic capacitance.
In the end i just reduced the coupling cap size
thanks,
Aaron