Importing SPICE models for some ICs into Multisim

  • Thread starter AMRITHAPRIYA K K
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In summary, the conversation discusses the need to simulate certain schematics in MULTISIM but not being able to do so due to some ICs not being available. The option of importing spice models for certain ICs is mentioned and the steps for doing so are requested. The specific IC 74LV4051PW (8:1 MUX) is mentioned and the steps for importing its spice model are discussed. The conversation also mentions the possibility of defining a .subckt or a macro array of SPST switches for accurate simulation. A link for creating custom component models in MULTISIM is provided. Finally, the level of simulation (functional/digital or full-resolution SPICE) is discussed.
  • #1
AMRITHAPRIYA K K
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We need to simulate certain schematics in MULTISIM but we are not able to do it since some of the ICs are not available in MULTISIM. We have got the spice models for some ICs. Will it be possible for anyone to help with the steps of importing spice models in MULTISIM?
 
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  • #2
Welcome to PF.

It should be possible without too many problems.
What ICs do you need to convert?

What similar ICs are available in MULTISIM now?
 
  • #3
I require many ICs for simulation . For few of them I got spice models but I am not able to import it. One of them is 74LV4051PW(8:1 MUX). Can you provide me with the steps?
 
  • #4
AMRITHAPRIYA K K said:
I require many ICs for simulation . For few of them I got spice models but I am not able to import it. One of them is 74LV4051PW(8:1 MUX). Can you provide me with the steps?
At what level do you want to simulate your circuits? At a functional/digital level, or a full-resolution SPICE simulation?
 
  • #5
AMRITHAPRIYA K K said:
One of them is 74LV4051PW(8:1 MUX).
Do you have a spice model for that?

I believe you will need to define a .subckt that can be imported.

The 4051 is a 1/8 analog bidirectional switch. It is made from CMOS, MOSFET transmission gates. I expect an accurate model will require you to identify the characteristics of the MOSFETs employed.

Alternatively, you mighty define it as a macro array of SPST switches.

Sometimes it is easier to simulate a circuit with spice.

https://www.multisim.com/help/components/creating-custom-component-models/
 
  • #6
berkeman said:
At what level do you want to simulate your circuits? At a functional/digital level, or a full-resolution SPICE simulation?

functional/digital level only
 
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  • #7
AMRITHAPRIYA K K said:
functional/digital level only
Then you don't need a full SPICE model, do you?
 

FAQ: Importing SPICE models for some ICs into Multisim

How do I import a SPICE model into Multisim?

To import a SPICE model into Multisim, first download the SPICE model file from the manufacturer's website. Then, open Multisim and go to 'Tools' > 'Component Wizard'. Follow the steps to create a new component, and when prompted, import the SPICE model by browsing to the downloaded file. Complete the wizard to add the component to your library.

What file formats are supported for SPICE models in Multisim?

Multisim supports SPICE models in .cir, .lib, .mod, and .sub file formats. These files typically contain the necessary netlist and model parameters required for simulation.

Can I edit a SPICE model after importing it into Multisim?

Yes, you can edit a SPICE model after importing it into Multisim. To do this, go to the 'Component' menu and select 'Edit Component'. This will allow you to modify the SPICE netlist, parameters, and other properties of the component.

Why is my imported SPICE model not working correctly in Multisim?

If your imported SPICE model is not working correctly, it could be due to several reasons such as syntax errors in the SPICE file, missing parameters, or compatibility issues. Check the model file for errors, ensure all necessary parameters are included, and verify that the model is compatible with Multisim's version of SPICE.

How do I verify that my imported SPICE model is functioning properly?

To verify that your imported SPICE model is functioning properly, create a simple test circuit using the component and run a simulation. Compare the simulation results with the expected behavior or reference data provided by the manufacturer. This will help ensure that the model is correctly imported and functioning as intended.

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