Mobility and Cox value

Well, many MOS models have "ron" as an operating point parameter - why not use that (if available) rather than trying to model it yourself. The mobility is often a model parameter (not an operating point parameter) such as "uo" and cox many not be exposed at all. Do you know what model is being used by your devices (which primitive device model; e.g. bsim4 - it probably will list this in the Spectre output log in the circuit inventory section)?

Regards,

Andrew

Thank you for the reply. Actually, I wanted to theoretically calculate the results that I got from the basic simulation. Mobility and cox values are often required in basic calculations. 

The primitive device model is bsim4. There are two parameters: ron and rout with 52.41 and 51.15 respectively. Which one should be considered? I tried to simulate Ron by putting a port on the drain side of a single transistor and calculated Ron through z11 real part, which is 56.73ohm. (with the required bias conditions of 1.2V at gate and 0V at drain).  can I consider it as Rds?

Meanwhile, the Rgate is also found zero in the DC operating point list! How can I verify both values, Rds and Rg of the simulated transistor model for the calculation of theoretical equations of basic circuits? Thank you