Hello everyone, I have a little doubt about the operation of the cap_var_lvt, I am working on a ring oscillator, what I am looking for is that the frequency changes due to the voltage controlled capacitance, however when performing simulations varying the voltage that feeds the capacitor I don't get the frequency to change, it is always about 92MHz, anyone knows why this happens?, or maybe I am not understanding well the operation of cap_var, thank you very much for your attention, attached images of the circuit and the results obtained.

I have tried the example below and i see varying frequency as expected.The varactor 'b' pin is the substrate pin and should be to gnd.