I have this kind of MOSFET model:
*************************************************
.model nmos. NMOS
+ LEVEL=1
+ LMIN=0.5e-6 LMAX=50e-6 WMIN=0.9e-6 WMAX=1
+ VTO=0.7 GAMMA=0.45 PHI=0.9
+ NSUB=9e14 LD=0.08e-6 UO=350 LAMBDA=0.1
+ TOX=9e-9 PB=0.9 CJ=0.56e-3 CJSW=0.35e-11
+ MJ=0.45 MJSW=0.2 CGDO=0.4e-9 JS=1.0e-8
.model pmos. PMOS
+ LEVEL=1
+ LMIN=0.5e-6 LMAX=50e-6 WMIN=0.9e-6 WMAX=1
+ VTO=-0.8 GAMMA=0.4 PHI=0.8
+ NSUB=5e14 LD=0.09e-6 UO=100 LAMBDA=0.2
+ TOX=9e-9 PB=0.9 CJ=0.94e-3 CJSW=0.32e-11
+ MJ=0.5 MJSW=0.3 CGDO=0.3e-9 JS=0.5e-8
*************************************************
And i want to use it in LTspice but it doesnt work... Do i need to edit it?

 

Do i need to edit it?

Yes. Paste the text onto your schematic as a spice Directive, then correct 'nmos. NMOS' and 'pmos. PMOS' to 'nmos NMOS' and 'pmos PMOS' respectively.

 

I just did it... Same as before. But arent 'nmos.' and 'pmos.' just the transistor model names? So changing it to: without a dot wont change anything? Or this model just doesn't work... I was tasting it on simple inverter and i got output signal same as input.

 

My LTspice MOS library (LTC\LTspiceIV\lib\cmp\standard.mos) has the models in this form for nchannel and pchannel devices:

.model Si7386DP VDMOS(Rg=1.7 Vto=2.57 Rd=3.5m Rs=1.4m Kp=58 Lambda=.014 Cgdmax=.67n Cgdmin=.1n Cgs=1.56n Cjo=1.56n Rb=6m Is=2.3p N=1.075 tt=25n mfg=Siliconix Vds=30 Ron=7m Qg=11.5n)
.model Si7409DN VDMOS(pchan Rg=3 Vto=-0.8 Rd=7.6m Rs=5.7m Rb=10m Kp=72 Cgdmax=1n Cgdmin=.25n Cgs=1.7n Cjo=.5n Is=50p mfg=Siliconix Vds=-30 Ron=19m Qg=25n)

so you might try modifying your model to correspond. Note that the pchannel device have "pchan" as the first word in parenthesis but the nchannel device has no indicator (apparently nchannel is assumed if "pchan" is not there).

 

Or this model just doesn't work..

It works just fine for me.

 

Wierd... What could i make wrong if its working for u :/

 

Wierd... What could i make wrong if its working for u :/

I'd look for a typo.

 

Are you sure you have the model text as a Directive (a 'dot command'); not a Comment ?

 

It works ! My mistake was that I wasnt declaring transistor sizeing...

 

Good that it works for you. I didn't need to declare transistor size though.