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lkk_steven
Joined: 26 Mar 2006
Posts: 1
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 29 Mar 2006 17:41 multisim ac analysis bandwidth |
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i am wondering how to measure the bandwidth of my system,let's say if i am given 741 op-amp, how can i measure the operating bandwidth of it using MultiSim? Which tool should i use? Bode plotter?
Thank you.
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ali007
Joined: 06 Feb 2006
Posts: 11
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27 Jul 2006 2:16 how to find 3db bandwidth using multisim |
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| I am not sure if there is a tool which will show you the bandwidth directly. However, you can run "AC analysis" and set the vertical scale to be in decibels. Measure the 3 dB drop using the cursor.
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EDA_fan
Joined: 27 Jul 2006
Posts: 11
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27 Jul 2006 20:26 Re: Do anyone know how to measure bandwidth using MultiSim? |
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Hi,
Multisim version 9 lets you run an AC analysis, and use cursors to measure bandwidth, just like you would in the lab. You can also attach a bode analyzer to your circuit, and use cursors that way.
I found out that you can also right click on the cursors and choose "set Y-value" or something, and they will automatically go to the frequency where that Y value appears.
Altough the default scale is Volts/Volt on the Y axis for an AC analysis, you can change this to decibals in the properties for that left axis.
Happy simulating!
EDA_fan
| Quote: |
i am wondering how to measure the bandwidth of my system,let's say if i am given 741 op-amp, how can i measure the operating bandwidth of it using MultiSim? Which tool should i use? Bode plotter?
Thank you. |
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| Back to top |
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silver85
Joined: 06 May 2006
Posts: 30
Helped: 1
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03 Aug 2006 9:17 Do anyone know how to measure bandwidth using MultiSim? |
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make ac analysis from simulation menu.
for example (default values) 1Hz-1Gz.
but before this you must give the input and output and referances' node numbers in ac analysis menu.and for this you must open node numbers to see.
after ac analysis 2 graphs you will see. Amplitute-frequency graph is your bode diagram. you will see that the magnitute is decreasing in very small and high frequencies. for the band with in Hz you must click x-y button at the top in graph viewer.than you will see the magnitude. we know that cut off frequencies is at -3dB and this equals to 0.707 of the magnitude. with this you will find lower and higher cut off frequency values. and bandwith is higher cut off frequency- lower cut off frequency.
thats it.not so hard. only ac analysis...
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