Flip Flops and clocks with multisim

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Discussion Overview

The discussion revolves around the implementation of clock pulses in circuits using flip flops within the Multisim simulation environment. Participants explore how to generate clock signals, their sources, and the appropriate components to use in both simulation and real circuits.

Discussion Character

  • Technical explanation
  • Homework-related
  • Exploratory

Main Points Raised

  • One participant inquires about the source of clock pulses for flip flops, suggesting a voltage source and switch might create a square wave.
  • Another participant mentions using a Voltage Source in SPICE-based packages to set parameters for clock frequency and voltage levels.
  • A participant discovers an AC source in Multisim that produces square waves and questions the correct wiring to connect it to the CLK of the flip flops.
  • It is confirmed by another participant that connecting one end of the AC source to ground and the other to the CLK is the correct approach.
  • One participant shares a resource indicating that Multisim uses a function generator to create square waves for clock signals, noting that a previously attempted "clock source" did not work.
  • Another participant supports the use of a function generator for clock signals based on their experience in a digital circuit design course.
  • A later reply provides specific instructions on locating a digital clock component in Multisim, suggesting it as a solution to the initial query.

Areas of Agreement / Disagreement

Participants generally agree on the use of function generators for creating clock signals in Multisim, but there are varying suggestions regarding the specific components and methods to achieve this, indicating multiple approaches are being discussed.

Contextual Notes

Some participants express uncertainty about the exact wiring and configuration of components, and there is a lack of consensus on the best method for generating clock signals in both simulation and real circuits.

Who May Find This Useful

This discussion may be useful for students and practitioners working with digital circuits, particularly those using Multisim for simulation and design of flip flop-based systems.

ranger
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Hey all,

I'm trying to build a circuit using flip flops that passes data in series using multisim. My problem is with the clock. I know that data isn't moved until a clock pluse comes along. My problem is that what exactly is the source of this (clock) pulse. Could it be a voltage source and a switch, opening and closing the switch causes the square wave? If not, how do I put a clock in multisim and in a real circuit?

I ask this because the schematics I've been looking at only shows the clock as square waves or coming straight from something that says "clock".

--thank you:smile:
 
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I'm not familiar with MultiSim, but in MicroCAP and most other SPICE based packages, you would put down a Voltage Source, and set its parameters for the clock frequency and voltage levels. Does that work for you?
 
Umm...now that you mention frequency (which I had completely ignored before), I did some more searches in multisim's component database. I think I may have found something. It looks like a AC source but instead of the sine wave, it has square waves. And it also has settings for frequency and voltage. I think that may be it.

But I wiring it up, do I put one end of it to ground and the other running to CLK of the flip flops?

thanks again.
 
ranger said:
But I wiring it up, do I put one end of it to ground and the other running to CLK of the flip flops?
thanks again.
Yep, you've got the right idea.
 
yes you need to use function generator for clock usage. I got digital circuit design course in university and we used fnc generator in labs for CLK.
 
Go to "Place>component>sources>digital_sources>digital_clock" from your multisim. i found it in my multisim11... i think you got your specific answer... :)
 

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