What is the significance of phase inversion in an operational amplifier?

  • Thread starter Hyperspace2
  • Start date
In summary: Hi,If you look at each signal individually, you would only see signals with the same shape and frequency.But if you would use an oscilloscope, you would see the difference.If you look at your signals with a single channel oscilloscope then you will not see any 'inversion' - the scope will trigger the same way whatever phase of signal you give it and your "arc signal" will look the same, (or perhaps a different amplitude). You will only be aware of a phase difference if you show input signal (to trigger the scope with) on one channel and look at the two output signals, in turn, on the other channel. One will be in phase with the input and the other will be the other
  • #1
Hyperspace2
85
1
In inverting operational amplifier when the signal is sent in -(minus) side then the signal is inverted at output. what does that mean? Whether it starts from postive half cycle or negative half cycle , it is an ac. I don't think it will make physical differences. I am so confused. Anyone can help. Advance thanks.
 
Last edited:
Engineering news on Phys.org
  • #2
http://en.wikipedia.org/wiki/Operational_amplifier_applications#Differential_amplifier

300px-Op-Amp_Differential_Amplifier.svg.png
 
  • #3
Consider it a pulley.
If you pull the rope downwards then the other side goes upwards. And vice versa.

So it means when the input voltage rises, the output voltage will lower.
 
  • #4
nivaOne said:
Consider it a pulley.
If you pull the rope downwards then the other side goes upwards. And vice versa.

So it means when the input voltage rises, the output voltage will lower.

I wasn't talking about that . I was talking about following phrases


"A signal fed into the + input (non-inverting) will produce an output signal that is in phase with the input signal. A signal fed into the - input (inverting) will produce an output signal that is 180 degrees out of phase with the input signal"

I was just trying to ask what is the differences between the input signal and the output signal that is 180 degrees out of phase of the input signal. I see them same ,because anyway they are the ac signal .
 
  • #5
Hyperspace2 said:
I wasn't talking about that . I was talking about following phrases


"A signal fed into the + input (non-inverting) will produce an output signal that is in phase with the input signal. A signal fed into the - input (inverting) will produce an output signal that is 180 degrees out of phase with the input signal"

I was just trying to ask what is the differences between the input signal and the output signal that is 180 degrees out of phase of the input signal. I see them same ,because anyway they are the ac signal .

Hi,
If you look at each signal individually, you would only see signals with the same shape and frequency.
But if you would use an oscilloscope, you would see the difference.
 
  • #6
If you look at your signals with a single channel oscilloscope then you will not see any 'inversion' - the scope will trigger the same way whatever phase of signal you give it and your "arc signal" will look the same, (or perhaps a different amplitude). You will only be aware of a phase difference if you show input signal (to trigger the scope with) on one channel and look at the two output signals, in turn, on the other channel. One will be in phase with the input and the other will be the other way up - in antiphase.
 

FAQ: What is the significance of phase inversion in an operational amplifier?

How can you explain why there are no differences?

There are a few possible explanations for not seeing any differences. It could be due to limitations in our perception or measurement tools, or it could be that the differences are too subtle to detect. It's also possible that there truly are no differences present.

Is it possible that there are differences, but we just haven't found them yet?

Yes, it is possible that there are differences that we have not yet discovered. Science is an ongoing process of discovery, and our understanding of the world is constantly evolving. As technology and techniques improve, we may be able to detect differences that were previously undetectable.

How can you be sure that there are no differences?

It's important to carefully design experiments and control for all possible variables in order to confidently conclude that there are no differences. Replicating the experiment and obtaining consistent results also adds to the validity of this conclusion.

What if the differences are too small to be significant?

In science, we use statistical analysis to determine if the differences we observe are due to chance or if they are truly significant. If the differences are too small to be statistically significant, it could mean that they are not meaningful or relevant in the context of the experiment.

Can't we just use our common sense to determine if there are differences?

While common sense can be a useful tool, it is not always reliable when it comes to scientific inquiry. Our perceptions and biases can often cloud our judgement, which is why we rely on rigorous experimentation and objective analysis to draw conclusions about differences.

Similar threads

Cannot lock reference signal on lock-in amplifier
Replies
5
Views
1K
Can LCL Filter Convert AC to DC for Half Bridge Section?
2
Replies
39
Views
3K
Window Comparator: Understanding the Output Behavior and Common Errors
Replies
5
Views
2K
Trouble with getting AM receiver to work
Replies
29
Views
4K
Amplitude modulation and amplifier efficiency
Replies
3
Views
5K
Amplify Very Weak AC Signal Using Op-Amps
Replies
5
Views
8K
Amplifying AC Signal: LM358 Op-Amp Circuit for Full AC Signal Amplification
Replies
3
Views
6K
What are the internal mechanisms of the 741 Operational Amplifier?
Replies
8
Views
4K
"Ground" and "Center Tapped" Power Transformer Secondary in guitar amp
Replies
6
Views
3K
Basic question: What is amplifier saturation?
Replies
4
Views
28K

Hot Threads

Recent Insights

Back
Top