MultiSim 8 Quick Start.pdf

multi SIM 8

Simulation & Capture

Quick Start with Multisim 8

This booklet leads you through the circuit design flow, from schematic capture,

through simulation and analysis. You will design and test a circuit that samples

a small analog signal, amplifies it and then counts the occurrences of the signal

on a simple digital counter.

Schematic Capture

In this section, you will place and wire the components in the circuit shown

below.

Saving the File

When you first launch Multisim, the program opens a blank file on the

wo rkspace called “Circuit1”.

To save the default file with a new name:

1. Select File/Save to display a standard Windows Save dialog.

2. Navigate to the location where you want to store the file, and enter

“MyQuickStart” as the filename, and click on the Save button.

To guard against accidental loss of data, you can set up a timed auto-backup

of the file in the Save tab of the Global Preferences dialog box.

To view files from earlier versions of Multisim, select the desired version in the

Files of Type drop-down in the Open dialog.

— 2 —

Placing the Components

1. Select Place/Component to display the Select a Component browser, navigate

to the 7-segment LED display as shown below and click OK. The component

appears as a “ghost” on the cursor.

Once you have selected the desired Group and Family, you can start typing

the component’s name. In the above example, type SEVEN_SEG_DECIMAL_

COM_A_ BLUE. Matches are displayed as you type.

2. Move the cursor to the bottom-right area of the workspace and left-click to

place the component. Note that the Reference ID for this component is “U1”.

3. Place the remaining components in the Digital Counter area as shown below.

As you place the 200-ohm resistor, rotate it to a vertical orientation.

Hit Ctrl-R as you move it to the desired location.

Reference IDs (e.g., U1, U2) are assigned in the order the components are

placed. If you place components in a different order than in the original

circuit, the numbering will differ. This will not effect the operation of the

circuit in any way.

— 3 —

4. Place the parts in the Counter Control section. After placement, right-click

on each of the SPDT switches and select Flip Horizontal.

The SPDT switches are in the Basic Group;

Switch Family.

When a part is on the workspace and you want

to place the same part again, highlight it and

select Edit/Copy, then Edit/Paste.

5. Place the parts in the Analog Amplifier and Bypass Capacitors section as

shown below, rotating as needed.

After you place the AC voltage signal source, double-click on it. Change the

Vo ltage (Pk) to 0.2 V and click OK to close the dialog.

6. Place the header and associated parts as shown below.

J3 is in the Basic Group; Connectors Family.

Once you have wired a circuit, you can drop

two-pinned passive components like resistors

directly onto a wire. Multisim automatically

makes the connection.

Wi r ing the Circuit

Multisim is modeless; there is no need to toggle between wiring and part

placement modes. As soon as your cursor is over a pin, Multisim knows you want

to wire and the pointer changes to a crosshair.

You can wire the circuit that you placed on the workspace or you can use

“QuickStart1.ms8” from the “Samples\QuickStart” folder.

— 4 —

To wire the circuit:

1. Click on a pin on a component to start the connection and move the mouse.

A wire appears, attached to your cursor.

2. Click on the destination pin to finish the connection. Multisim

automatically and intelligently places the wire.

3. You can manually control the flow of the wire by clicking on points as you

move the mouse. Each click “fixes” the wire to that point.

4. Wire the Digital Counter section as shown below.

Use Bus Vector Connect to wire multi-pinned devices like U3 and U1 together.

Refer to the Helpfile for details.

Virtual Wiring — To avoid clutter, you could use virtual connections between

the Counter Control and Digital Counter sections. When two nets have the

same name, they are virtually connected.

5. Finish wiring the circuit as shown below.

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