.MODEL
Defines a model for a diode, transistor, switch, lossy
transmission line or uniform RC line
Some circuit elements, for example, transistors, have many
parameters. Instead of defining every transistor parameter
for every instance of a transistor, transistors are grouped
by model name and have parameters in common. The
transistors of the same model can have different sizes and
the electrical behavior is scaled to the size of the
instance.
Syntax: .model[( )]
The model name must be unique. That is, two different
types of circuit elements, such as a diode and a
transistor, cannot have the same model name. The parameter
list depends on the type of model. Below is a list of
model types:
| Type Associated | Circuit Element |
|---|---|
| SW | Voltage Controlled Switch |
| CSW | Current Controlled Switch |
| URC | Uniform Distributed RC Line |
| LTRA | Lossy Transmission Line |
| D | Diode |
| NPN | NPN Bipolar Transistor |
| PNP | PNP Bipolar Transistor |
| NJF | N-channel JFET model |
| PJF | P-channel JFET model |
| NMOS | N-channel MOSFET |
| PMOS | P-channel MOSFET |
| NMF | N-channel MESFET |
| PMF | P-channel MESFET |
| VDMOS | Vertical Double Diffused Power MOSFET |
See the description of the circuit element for a list
of which parameters are instance specific and which
are common to a model.