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This module provides a brief introduction to interactive schematic capture and layout in National Instruments Multisim. Multisim is fully featured SPICE schematic capture and simulation tool used for circuit design, simulation, and in combination with Ultiboard for layout of custom PCBs.

Schematic capture in multisim

The benefits of integrated capture and simulation

Multisim provides users with the unique ability to capture and simulate from within the very sameintegrated environment. The advantages of this approach are many. Users new to Multisim do not have to worry about sophisticatedSPICE (Simulation Program with Integrated Circuit Emphasis) syntax and commands, while advanced users have easy access to all SPICEdetails.

Multisim makes capturing schematics easier and more intuitive than ever. A spreadsheet view allows users to easilymodify characteristics of any number of components simultaneously: from PBC footprint to SPICE model. Modeless operation provides themost efficient way of placing components and wiring them together. Working with both analog and digital multisection components isintuitive and simple.

In addition to traditional SPICE analyses, Multisim allows users to intuitively connect virtual instruments totheir schematics. Virtual instruments make it fast and easy to view interactive simulation results by replicating the real-worldenvironment.

Multisim also provides special components known as interactive parts which can be modified while a simulationis running. Interactive parts such as switches and potentiometers, will immediately and accurately affect the results ofsimulation.

When the need arises for more advanced analysis, Multisim delivers over 15 sophisticated analyses. Someexamples of analyses include AC, Monte Carlo, Worst Case, and Fourier. Provided natively within the Multisim environment is apowerful Grapher, which allows the customized viewing of simulation data and analyses.

The integrated capture and simulation environment provided by Multisim is a natural fit for any circuitdesigner, and will save both time and frustration throughout the entire circuit design process.

The multisim environment

Introducing the multisim environment

Multisim’s user interface consists of the basic elements, illustrated in Figure 1 below.

The MultiSim Environment

The design toolbox

The Design Toolbox is used to manage various elements in the schematic. The Visibility tab lets you choose whichlayers to display on the current sheet on the workspace. The Hierarchy tab contains a tree that shows the dependencies of thefiles in the design that you have open. The Project tab displays information about the current project. Users can add files to theexisting folders of the current project, control access to files, and archive designs.

Configuring global options

Global options allow users to configure specifics of the Multisim environment. They can be modified byaccessing the preferences dialog box. Choose Options/Global Preferences. The Preferences dialog box appears, offering you thefollowing tabs:

•Paths—where you can change the filepaths for the databases and other settings.

•Save—where you set up Auto-backup timing and whether you want to save simulation data with instruments.

•Parts—where you set up component placement mode and the symbol standard (ANSI or DIN). You also set up defaultdigital simulation settings.

•General—where you set up selection rectangle behavior, mouse wheel behavior, bus wiring and auto-wiringbehavior.

Various Global Preferences

Configuring sheet options

The Sheet Properties dialog box is used to set up the preferences for each sheet. These preferences are saved withthe circuit file so that if the circuit is opened on another computer, it will use the same settings.

The sheet specific settings are arranged in the following tabs:

•Circuit—where you set the color scheme and the display properties of workspace text.

•Workspace—where you set the sheet size and properties.

•Wiring—where you set the wire and bus options.

•Font—where you select the font, font size and style for text elements on the circuit.

•PCB—where you set up options for your printed circuit board.

•Visibility—where you enable and disable custom annotation layers.

Consult the Multisim User Guide or Multisim helpfile for a detailed description of each sheet property.

Various Sheet Properties

Customizing the user interface

The Multisim user interface is highly customizable. Customizations are context sensitive. Toolbars may bedocked in various positions and orientations. The contents of the toolbars may be customized. New toolbars may be created. The menusystem is fully customizable, including all pop-up menus for the various object types.

As well, the keyboard shortcut system is customizable. This allows for key combinations to be assigned toany command that may be placed in a menu or on a toolbar.

Note: To avoid interfering with interactive simulation, it is recommended that users only assign commands tokey combinations (such as Ctrl-E).

For example, the toolbars and docking windows may be re-configured as you move from a circuit sheet to a description sheet.

To customize the user interface, select Options/Customize User Interface. Using the Customize dialog, userscan create or modify toolbars, assign or change keyboard shortcuts, customize and create menus, and modify the way the user interfaceappears.

Customize Dialog Box

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
Abhi
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
hmm
Abhi
is it a question of log
Abhi
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Abhi
Commplementary angles
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Uday
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
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a perfect square v²+2v+_
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algebra 2 Inequalities:If equation 2 = 0 it is an open set?
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or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
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Kristine 2*2*2=8
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Differences Between Laspeyres and Paasche Indices
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No. 7x -4y is simplified from 4x + (3y + 3x) -7y
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. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
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I start with an easy one. carbon nanotubes woven into a long filament like a string
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what is system testing?
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preparation of nanomaterial
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Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
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good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
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Prasenjit
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Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
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the Beer law works very well for dilute solutions but fails for very high concentrations. why?
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how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:  OpenStax, Introduction to multisim schematic capture and spice simulation. OpenStax CNX. Sep 26, 2006 Download for free at http://cnx.org/content/col10369/1.3
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