1.0 PSPICE to Multisim Tutorial: Placing Resistor and Capacitors
1.1 Opening the Software
In PSPICE, you will have traditionally opened the “Schematics” application via the following step (Programs >>PSPICE Student >> Schematics), prior to simulating the design.
To open Multisim, you must access Start >> All Programs >> National Instruments >> Circuit Design Suite 11.0 >> Multisim 11.0.
1.2 Placing the Op-Amp
In PSPICE, you need to open the “Get New Part” window, and then search for “opamp” in the description box. After searching for the appropriate model, and attaching it to your device symbol, you can click “Place and Close.” It is then time to orientate the part appropriately. By double-clicking on the Op-Amp, you can set parameters for simulation.
To place a component in Multisim;
Figure 1. Select a Component Interface
Figure 2. Operational Amplifier
1.3 Placing Resistors and Capacitors
In PSPICE, you would now return to the “Use Get New Part” and search for a component named “R” and “C,” which describes a resistor and capacitor, respectively. Once you have placed two resistors and one capacitor on your schematic, you need to set the values on each component by double-clicking on each and individually changing the parameter value.
To place the resistors and capacitors in Multisim:
Figure 3. Placing a resistor
Figure 4. Placing a Resistor
Figure 5. Your Design at the End of Stage 1
2.0 PSPICE to Multisim Tutorial: Adding Power Components
2.1 Adding Voltage Sources and Ground
In PSPICE, you now return to the “Use Get New Part” and search AC voltage sources, which are denoted as VAC. You will need to search out a parameter called ACMAG, which is the AC Magnitude. Place the part. Next search for a ground symbol called GND_EARTH.
To place the sources in Multisim:
Figure 6. Your Design at the End of Stage 2
3.0 PSPICE to Multisim Tutorial: Wiring Components
3.1 Wiring Process
In PSPICE, you must now search for and select the “Draw Wire” button, or select an option for the Draw menu. You can only then connect the various nodes.
Multisim uses a modeless wiring environment, allowing you to easily draw net connections:
Figure 7. Completed Schematic
4.0 PSPICE to Multisim Tutorial: Setting Up a Simulation
4.1 Setting Up an Analysis
In PSPICE, you will now set up an analysis. The analysis setup requires setting node names, enabling a certain type of analysis from a single “analysis interface,” and setting the start frequency (Start Freq), stop frequency (End Freq), points per decade (Pts/Decade), and sweep type (Decade).
In Multisim, the process has been somewhat simplified.
Figure 8. Placing a Measurement Probe
5.0 PSPICE to Multisim Tutorial: Running a Simulation
5.1 Running an AC Analysis
In PSPICE, to view simulation data, you must open a plotting window and via the “add trace” button, or trace menu, plot various values and parameters onto the axis. You also need to do things such as create a decibel scale through an expression.
In Multisim, you need to follow these simple steps:
Figure 9. Multisim Analysis Data in the Grapher
Figure 10. Setting Cursors
Figure 11. -3dB point
Congratulations! Having stepped through this article you are now ready to begin capturing and simulating with Multisim.
You have been exposed to some of the simple capabilities of Multisim. Similar to PSPICE, there are a number of advanced features that you can easily learn about. One of the great advantages of using Multisim, is that you can accomplish such advanced tasks easier.
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