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/* Three Types of Device Models */
* S-Parameter Models
Many of B2.Spice's generic devices have process models, also known as technology models. These are standard SPICE or XSPICE models that have been hard-coded into [[RF.Spice A/D]]. A process models has a fixed preset number of [[parameters]]. Some examples include are Resistor, Capacitor, Inductor, Diode, BJT, JFET, MOSFET, MESFET, Voltage- or Current-Controlled Switch, to name a few. When you open the property dialog of a part with a process model, you usually see a list of the device [[parameters]] with their default values as well as edit fields for changing their values.
Subcircuit simulation models are usually in the form of a standard Netlist code starting with the ".SUBCKT" command and ending with the ".ENDS" command. The Netlist subcircuit determines the number of the device's terminals or pins. Some simulation models may not have editable [[parameters]]. Their simulation model simply executes the given Netlist code during a simulation. On the other hand, [[RF.Spice A/D]] offers "Parameterized Subcircuit Models". These models can have an arbitrary number of [[parameters]], which appear in the device's property dialog very similar to the process models. You can change the values of these [[parameters]] at any time and save their values with your circuit project.
