Changes
/* Using Device & System Parameters as Variables */
[[File:b2MAN_Fig4.png|thumb|220px|RF.Spice A/D Circuit Parameters Tab.]]
Each part in [[RF.Spice A/D]] has one or more parameters. Most of these parameters have numeric values like the resistance of a resistor, or the capacitance of a capacitor, or the forward beta (bf) of a bipolar junction transistor. Some other parameters might be Boolean, that is, they take only binary values: "True" of "False". There are also string parameters such as the name or label of a part. Most of device parameters can be changed during a simulation. Besides device parameters, there are also system parameters like temperature, time of a transient simulation or frequency of an AC analysis, or SPICE simulation parameters. You can also define your own parameters and use them as the values for other parameters. Device and system parameters can be varied during a "Sweep" or "Monte Carlo" test. To find out more about these types of tests, please refer to the section on "[[Parametric Sweeps and Monte Carlo Tests]]".
You can also vary parameters in real time during a live simulation. Oddly named but quite useful, the Parameters tab of the Toolbox presents a small spreadsheet-like grid which lists all the parts in the circuit available for scrutiny. This includes only those parts which allow value changes such as resistors, capacitors, current and voltage sources, and inductors, but not the ground. The part’s name is displayed in the left cell, while its value is displayed in the right cell. Use the radio buttons labeled "All", "Some" and "Few" (default) to expand to shrink the list of displayed devices and properties. The "Few" button lists just the primitive devices and their values, such as a resistor's resistance, inductor's inductance, and so forth. The "Some" button will add more sources and their properties, and the "All" button lists every device and parameter that is accessible in your project.
