Feedback assists in maintaining the stability within a system. Feedback occurs when a system's outputs are routed back as the inputs as part of a cause-and-effect chain that forms a circuit or the loop. The system is said to feed back into itself.
Positive feedback occurs when the signal feedback from the output is in phase with the input signal. Negative feedback occurs when the signal feedback has the opposite polarity or is 180 degrees out of phase with respect to the input signal. When it comes to the feedback system, the concept of cause-and-effect must be handled with caution.
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