What is the difference between megative feedback and positive feedback? Which is typical used in op-amp...

What is the difference between megative feedback and positive feedback? Which is typical used in op-amp circuits?

Expert Solution

As we know feedback is process in which part or portion of output signal is fed back to input port. It is used to control dynamic behaviour of the circuit or system.

There are two types of feedback in amplifier.

• Positive feedback

• Negative feedback

Positive feedback : If original input signal and feedback signal are in phase, the feedback type is known as positive feedback. It tends to increase the output.

Negative feedback: If original input signal and feedback signal are out of phase, the feedback type is known as negative feedback. It tends to reduce the output.

Parameters	Positive feedback	Negative feedback
Phase shift	0 or 360 degrees	180 degrees
Noise	increase	decrease
Feedback signal	in phase	out of phase
Gain	increases	decreases
Stability	poor	better

Negative feedback is used in Op-amps.

genius_generous answered 2 years ago

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