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There are no such "default" values.Every NMOS has its' own SPICE model parameters.
In additional to, W,L,Tox,Vto etc. are not SPICE parameters,They are physical and process dependent parameters and they cannot be used SPICE or similar simulators.
Here are the Spice parameters for a typical N-MOSFET, BUZ11:
.model BUZ11 VDMOS( Rg=3 Rd=5m Rs=1m Vto=3.0 Kp=9 Cgdmax=2n Cgdmin=.15n Cgs=0.8n Cjo=1n Is=2.3p Rb=6m mfg=Fairchild Vds=50 Ron=40m Qg=27n)
As you can see there are no W, L, Tox, GAMMA..etc process parameters except for Vto and Kp.
Spice does not use most process parameters nor does it recognize them if you enter them in the model.
Because it uses the default NMOS model. Review breakout.lib to see the mbreakn definition.why does the mbreakn transistor from breakout pspice library has no SPICE parameters?
Surely it does. See MOS parameter list.So, it does looks like Pspice use W,L parameters.
What?
I simulated the mbreakn transistor, if it doesn't have default process parameters then how does it behaves like a transistor? Look at mbreakn transistor model file shown with above picture, it looks like empty file.
Pspice does use those process parameters. I have a circuit text file and bring it into pspice, it does simulated
What Analog Devices/MOSFET/MOSFET parameters? I don't have it.Reading the PSpice reference manual had saved this thread.
All available MOS model parameters and their default values are listed under Analog Devices/MOSFET/MOSFET model parameters.
Because it uses the default NMOS model. Review breakout.lib to see the mbreakn definition.
Surely it does. See MOS parameter list.
I already found mbreakn, which is under breakout.lib.One ineffective way is to use the window explorer search on the top right and type Mbreakn.
The keyword in my post is PSpice reference manual. I can't believe that your are using PSpice without ever reviewing this essential document. Analog Devices/MOSFET/MOSFET parameters is referring to a specific paragraph in the reference manual.What Analog Devices/MOSFET/MOSFET parameters? I don't have it.
That's what I said.There's nothing under mbreakn definition except one line. .model Mbreakn NMOS
and where's NMOS defined? It's not under anywhere. It's not under breakout.lib , nor under anlg_dev.lib, none found
T NMOS is name of a the generic model. It has built-in default parameters.
It says "if L and W default not set, their default value is 100 u" . So W=100u, L=100u by default.Again, if you want to know the default NMOS parameters, read the reference manual.
How do you know that ??? Ids is proportional to W/L ratio ( and to process dependent others ), absolute W and L values have no sense without necessary process information.It says "if L and W default not set, their default value is 100 u" . So W=100u, L=100u by default.
If I want to set 10x the width, then M=10 as multiplier.