Inductor equivalent circuit

[sonaiko]

I know that practically each inductor has a series resistor and a parallel capacitor. Their values depend mainly on the layout and the technology used to model the inductor.

My question is that as an estimation, I need to know the values for these series resistance and the capacitor to help me simulate inductors with better accuracy. Right now I do not want to go through layout.

The technology I am using is 0.18um CMOS. How much as estimation should I expect the resistance to be for each 1nH?
Like around 1~5ohm?
or 50~100ohm?
or 0.1~0.5ohm?

Also how much capacitance for each 1nH?
1fF?
10fF?
100fF?
1pF?

 

[nasimesahar]

HI

it really depend on the technology you are using. and u can calculate some typical values from Q factor and self resonance freq of inductors in published paper

for ex in one case I have for a L=2.5n, at 5.5 GHz Q ia 20 that means seris resistance is around 0.6-0.7 ohm

good luck.

Added after 7 minutes:

Hi mate

As I said earlier it depends on the process but I checked some reports and for some Si CMOS Tech I found the parallel capacitor around 10-20 fF.

good luck