Hello All,
I am working on an assignment for an analog electronics course. The assignment is to take a pre-designed op amp circuit (several of them; non-inverting, inverting, adder, and differential) calculate the gain, then measure the gain of actual circuit and compare the measured results to the calculated results.
The simulation software I am using is Multisim.
The circuits are fairly simple, and they all call for the same op-amp- a LM741J.
I have completed the first 3 parts of the assignment (non-inverting, inverting, and adder), and am seeing a trend that leads me to believe that I am doing something wrong, but the assignment is so simple it seems hard to mistake(not that I'm not capable, or anything).
In scenarios where the gain is high, my measurements are capping out under where the output voltage should be.
Here is an example...
Non-inverting op amp circuit with the previously mentioned op-amp.
Vin/Freq = 4Vrms/1kHz
Rf= 5kohm
Rg=1kohm
I calculate the gain at 6... using the formula
Gain=1+ (Rf/Rg)
Simple so far, right?!
Well my measured gain is 3.15. This is an anomaly. For this type of circuit, I have a total of 5 different circuits with varying component values and the other measured values equal their respective calculated values. (This one in particular does have the highest gain, the others being 2 or less).
In my novice state, I think, "maybe this op-amp is limited and its hit its limit..."
So I move on thinking nothing of it.
But the same trend continues with inverting type (again 5 different circuits with varying component values) and it gets worse with the adder circuit. (By worse I mean I can't get higher than about 12Vrms when I calculate anywhere from 15-27Vrms.
Can anyone shed some light and help to educate me, please?
I hope you followed the scenario ok, and this is not disjointed.
Feel free to ask for clarification.
Thanks for your time!!
I am working on an assignment for an analog electronics course. The assignment is to take a pre-designed op amp circuit (several of them; non-inverting, inverting, adder, and differential) calculate the gain, then measure the gain of actual circuit and compare the measured results to the calculated results.
The simulation software I am using is Multisim.
The circuits are fairly simple, and they all call for the same op-amp- a LM741J.
I have completed the first 3 parts of the assignment (non-inverting, inverting, and adder), and am seeing a trend that leads me to believe that I am doing something wrong, but the assignment is so simple it seems hard to mistake(not that I'm not capable, or anything).
In scenarios where the gain is high, my measurements are capping out under where the output voltage should be.
Here is an example...
Non-inverting op amp circuit with the previously mentioned op-amp.
Vin/Freq = 4Vrms/1kHz
Rf= 5kohm
Rg=1kohm
I calculate the gain at 6... using the formula
Gain=1+ (Rf/Rg)
Simple so far, right?!
Well my measured gain is 3.15. This is an anomaly. For this type of circuit, I have a total of 5 different circuits with varying component values and the other measured values equal their respective calculated values. (This one in particular does have the highest gain, the others being 2 or less).
In my novice state, I think, "maybe this op-amp is limited and its hit its limit..."
So I move on thinking nothing of it.
But the same trend continues with inverting type (again 5 different circuits with varying component values) and it gets worse with the adder circuit. (By worse I mean I can't get higher than about 12Vrms when I calculate anywhere from 15-27Vrms.
Can anyone shed some light and help to educate me, please?
I hope you followed the scenario ok, and this is not disjointed.
Feel free to ask for clarification.
Thanks for your time!!