Hi All,

I need someone to comment on my testbench for simulating varactor CV curve in cadence spectre. Pls find the attached image.

I calculate the capacitance from calculator -imag(i/v)/(2*pi*f).

I run ac simulation and sweep the control voltage of the varactor. I am not sure if this setup is correct because when i plug in this value in LC oscillator, i do not get the expected oscillation frequency. The frequency deviation is too large. Am i missing something in the setup?

Is there other methods to obtain CV plots more efficiently?

Regards

Mani