I am using HSPICE to design an RF circuit and I need to define a model for spiral inductance with some specification.
So in my case I need to define the value of the spiral widths, the Number of turns, the space and the diameter. And also to define the value of induction L, the quality factor Q and the frequency.
If you want to characterize a spiral inductor in real layout, you have to stick
1. to a real process, well characterized for this purpose, and
2. to a spiral inductor model which is characterized for this process
Within the limits of such a model you can change various geometrical parameters like no. of turns, diameter, width and distance of the inductor loops. The model will then calculate L and all its attributive parasitics. From these values you can calculate Q.