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Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?

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vishwasvogga

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Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?

Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?
 

Re: Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?

Where do you see "AC1" in the analysis?
 

Re: Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?

Never seen it either. Maybe something got entered in the
wrong field / place and it should really be "AC".
 

Re: Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?

vishwasvogga said:
Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?
Click to expand...

Are you referring to the error message below?

No AC stimulus found:
Set the value of a current or voltage source to "AC 1." to make it behave as a signal generator for AC analysis.

You have to select at least one voltage or current source in your circuit as a point for the introduction of an AC signal.

See attached.

 

Re: Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?

Whenever I use LTspice to make a plot of frequency response of a filter the signal generator always says "AC1" which is its AC reference amplitude. The actual amplitude in volts does not matter because the output level is compared to the input level with the difference in decibels.
 
Re: Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?

hi guys ,
my quetion is why it is AC1 why not AC2 or 3 , what does "1" means?
 

Re: Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?

vishwasvogga said:
hi guys ,
my quetion is why it is AC1 why not AC2 or 3 , what does "1" means?
Click to expand...

AC 1 = 1 VRMS.
It's specified in the AC amplitude field of a voltage source. You can make this value any value that makes sense for the simulation.
 
Re: Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?

hi eetech ,
when i entered AC 2 or AC 3 the shown gain and ugb is doubled and trip,led , how ? whatever the input stimulus amplitude the gain must be same ryt?
 

Re: Why do we use "AC1" while doing ac analysis in LTspice ? what does AC1 mean?

when i entered AC 2 or AC 3 the shown gain and ugb is doubled and tripled , how ?
Click to expand...
You are confusing output voltage with gain. Gain is Vout/Vin, so if Vin is unequal 1V, you need to calculate a ratio.
 

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