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/* Defining Analog & Mixed-Mode Inputs & Outputs */
[[RF.Spice A/D]] allows both analog and digital stimuli for live simulations. For analog stimuli, you can use the voltage and current sources or the Function Generator or Power Supply in the [[Virtual Instruments]] panel. For a digital stimulus, you can use a digital input, a digital source or a digital clock. In a mixed-mode circuit, you may define both analog and digital stimuli. Note that when you place a voltage or current source in a circuit, Workshop automatically adds a corresponding Function Generator for you.
The transient properties of a voltage source or a current source can be set in the transient page '''Transient''' tab of their property dialogs. This allows you to define a variety waveforms including constant DC, sinusoidal, square wave, exponential, and piecewise linear. A piecewise linear waveform is defined as a table of values vs. time. You can edit this waveform table right form the dialog by clicking the button labeled {{key|Edit Table}} and entering the (time, value) pairs row by row in a text editor, or . Or you can also import a these data from an external text file for this purposeby clicking the button labeled {{key|Load From File}}. To run a an AC-type test of your circuit, you need to define the AC additional [[parameters]]in the '''Small-Signal AC/Transient''' tab of the source's property dialog.
The voltmeter, ammeter and markers all can be used to probe voltages and currents for analog simulations. You can also probe the circuit using the [[Virtual Instruments]] such as the oscilloscope, voltmeter, ammeter, wattmeter, etc. You can use a digital output or digital probe to observe the state of your digital circuit. Mixed-mode circuits may involve both analog and digital probes. Note that virtual voltmeters and ammeters are added to the virtual instrument panel automatically every time you place a voltmeter or ammeter in your schematic.
