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Making CMOS Output Voltage, VDD and VSS Equal in Multisim

Updated Jan 18, 2023

Environment

Software

  • Multisim Base

I am using the CMOS digital components in NI Multisim and I set the VDD voltage to 3.3V. When I run the simulation and then I measure the output, I am reading 5V. How do I make the output voltage the same as VDD voltage?

Multisim treats digital input and output as high or low behind the scenes, Multisim converts a high to the component default voltage level which in this case is 5V. By assuming a high is 5V, Multisim can simulate faster. 

If you want the CMOS components to use the VDD voltage:
  1.  From the main menu select Simulate»Mixed Mode Simulation settings
  2. Select Use Real pin model.

Additional Information

This setting will force Multisim to add a pin driver to every digital input and output to convert a high and low logic to VDD and VSS.
This setting will also cause the simulator to take longer than usual to finish depending on the circuit complexity.

Related Links

How Do I Connect Power and Ground to a Digital Component in Multisim?

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