Simulating your Circuit

This explains how to carry out a simulation on your circuit and see the results displayed on the oscilloscope.  Although Multisim 2001 offers multiple types of simulation, including SPICE, VHDL, Verilog HDL, and combinations of these, this chapter covers only SPICE. Co-simulation with VHDL is introduced in Chapter 7 of this manual, while using VHDL or Verilog HDL to write code for programmable logic design or modelling complex digital chips is addressed in the Multisim 2001User Guide.

You are now ready to simulate your circuit.

You can either continue with the circuit you’ve been building in this chapter, or open the files tut3.msm from the Tutorial folder to begin with all the components correctly placed and wired together, and with the oscilloscope wired and set up correctly.

! To simulate the circuit, click the Simulate button in the Design Bar and, from the pop-up menu, choose Run.

Viewing Simulation Results

The simulation begins, but we need some way of displaying the results. One of the best ways is to use the oscilloscope we added earlier.

! To see the results in the oscilloscope, if necessary, double-click the oscilloscope icon to “open” the instrument display, if it isn’t already open.

If you changed the instrument settings as described in the previous chapter, you should soon see results looking something like this:

Also note that on the circuit window, in a capability unique to Multisim, the LED flashes on and off, displaying its behavior as it responds to circuit source stimulation during simulation.

We will now halt simulation of our circuit.