zhangjerome wrote on Jan 22nd, 2007, 11:03pm:Now The PDK I am using is based on BSIM3v3 model. I know it's difficult to calculate the noise manually from the given model parameters. Since the noise power of a MOS is equal to 4kT*gamma *gd0 and alpha=gm/gd0, I am wondering whether I can derive alpha and gamma from BSIM models? Are there any formulas between them?
No. gamma is an excess noise factor; usually one has 8/3 kT (gm + gds + gmbs), and the gamma allows the foundry to modify this. It's not something you can derive from other parameters.
Quote:My PDK does provide noise report for flicker noise but the parameters such as Noia, Noia are not contained in the model files. To include the flicker noise in the model, should I just add these parameters into the model files?
Noia, Noib, Noic are only used for the BSIM3 noise model; KF and AF are used for the Spice2 noise model (see AW's post). What is the value of NOIMOD in the model card? The default is 1.
Quote:And, I think the BSIM thermal noise doesn't contain gate induced noise. Is it right?
That's correct.