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This module provides a brief introduction to the creation and usage of sub-circuits 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.

Sub-circuits and hierarchical blocks

Multisim provides the ability to handle increasingly complex designs. In addition to multi-sheet designs,users can create sub-circuits (SC), and hierarchical blocks (HB) to modularize repetitive circuits, or to abstract sophisticateddesigns.

Subcircuits are useful for compacting existing designs that would be best kept in a single file.Hierarchical blocks are better suited for design reuse because they are stored in separate files and can be accessed for otherdesigns.

Hierarchical blocks and subcircuits are functionally identical; the only difference is in how theircontents are stored on disk.

Hierarchical blocks and subcircuits can be created using two methods, the first method is to highlight anexisting section of a circuit, and select Place/Connectors/HB/SC Connector. The second method is described below.

To place a new hierarchical block (2nd method):

  • Select Place/New Hierarchical Block and enter a filename.
Hierarchical Block Properties Dialog Box

or

  • Click on Browse, navigate to the folder where you would like to save the hierarchical block, enter a name and click Save. Youare returned to the Hierarchical Block Properties dialog box.
  • Enter the number of pins desired and click OK. A“ghost”image of the new hierarchical block appears. Click where you want the hierarchical block to appear.
  • Double-click on the new hierarchical block and select Edit HB/SC from the Hierarchical Block/Subcircuit dialog box thatdisplays. A circuit window that contains only the entered pins displays.
  • Place and wire components as desired in the new hierarchical block.
  • Wire the hierarchical block into the circuit.
  • Save the circuit.

Note: If you move or re-name a hierarchical block relative to the main circuit, Multisim will not be able tofind it. A dialog box will ask you to provide the new location for the hierarchical block.

To place an existing hierarchical block from a file, select Place/Hierarchical Block from file and follow thesame procedure.

To place a new subcircuit:

  • Select Place/New Subcircuit. The Subcircuit Name dialog box appears.
Subcircuit Name Dialog Box
  • Enter the name you wish to use for the subcircuit, for example,“PowerSupply”and click OK. Your cursor changes to a“ghost”image of the subcircuit indicating that the subcircuit is ready to be placed.
  • Click on the location in the circuit where you want the subcircuit placed (you can move it later, if necessary). Thesubcircuit appears in the desired location on the circuit window as an icon with the subcircuit name inside it.
  • Double-click on the new subcircuit and select Edit HB/SC from the Hierarchical Block/Subcircuit dialog box that displays. Anempty circuit window appears.
  • Place and wire components as desired in the new hierarchical block.
  • Select Place/Connectors/HB/SC Connector, and place and wire the connector as desired. Repeat for any other required Connectors.When you return to the main circuit, the symbol for the subcircuit will include pins for the number of connectors that youadded.
  • Wire the subcircuit into the circuit.

Replacing components with hierarchical blocks or subcircuits

Multisim allows users to easily replace existing components with a hierarchical block or subcircuit. Simplyselect the components which comprise the desired subcircuit or hierarchical block, and select Place/Replace by HierarchicalBlockor Place/Replace by Subcircuit.

Spreadsheet view

The Spreadsheet View provides a global perspective on object properties. It allows fast advanced viewingand editing of parameters including component details such as footprints, Reference Designators, attributes and designconstraints.

The Spreadsheet View can also be used to modify groups of components at a time. The view can be sorted byany column in either ascending or descending order. You can also export the contents to Microsoft Excel®for further reports.

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
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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