What is the difference between nmos, native nmos and medium?

native nmos

In the following model What is the difference between nmos, native nmos and medium? which type parameter values shoul I be using for hand calculations?



model name :
; * mosfet :
; * *--------------------------------------*
; * | mosfet type | 1.8v | 3.3v |
; * |======================================|
; * | nmos | n18 | n33 |
; * *--------------------------------------*
; * | pmos | p18 | p33 |
; * *--------------------------------------*
; * | native nmos | nnt18 | nnt33 |
; * *--------------------------------------*
; * | medium nmos | nmvt18 | nmvt33 |
; * *--------------------------------------*
; * | medium pmos | pmvt18 | ---- |
; * *--------------------------------------*

basic of native nmos

native : no adjust the Vt when process
medium: most low vt mos

native nmos

sunking said:

native : no adjust the Vt when process
medium: most low vt mos

Click to expand...

I didn't get it. Could you please elaborate on that?

nmos native

The big difference is they have different threshold voltage Vth.

native nmos vt

yes, as nxing said, the big difference is they have different threshold voltage Vth.
this is to say, for vth of nmos: native<medium<normal.
and you can get more information from the fundry and maybe you study some process knowedge.