Pspice or HSPICE coding for MOSFETs

Can anyone please tell what do we mean by LEVEL 1 or LEVEL 2 or LEVEL 3 and so on when we write the netlist in pspice or hspice while including mosfet models?

They are models of increasing complexity to better represent true MOSFET behaviours.

LEVEL refers to the MOSFET model that describes
the terminal I-V characteristics of the
transistors. LEVEL 1 is the simplest Mosfet model
and is in general sufficient for describing
discrete transistors.
However to simulate integrated circuit transistors, one need to use a more
sophisticated models. LEVEL 2 includes
extensive second-order models, while LEVEL 3
is a semi-empirical model that is better suited
for short-channel transistors. Another model
that is especially suited to model short-channel effects is called the BSIM model (LEVEL 13 in
HSpice).

Click to expand...

Keith

Thank you sir...

Hi everyone
Please help me with the delay measurement in HSPICE through graph as well as writing '.measure' command in the netlist.
I actually have the doubt that if we are taking two inputs A and B suppose in EXOR Gate and an output Y then how would the command be given?
Its something like-
.meas tran tdlay TRIG v(A) val=0.9 TD=0N Rise=1 TARG v(Y) val=0.9 TD=0N Fall=1
then how would the overall delay between input and output be measured?
Do we need to give two seperate commands like this...one for B and Y as well....and then taking the average....or there is some other procedure.
And i think i am not exactly clear with what delay is measured in digital circuits....is it overall delay between input and output...or something else..
Please explain...