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In Amplifier if feedback is occures when the feedback signals is in phase with the input signal the feedback is known as Positive feedback. And the feedback is occures when the feedback signals is out of phase with the input signal the feedback is known as negative feedback.
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∙ 15y ago
Negative feedback helps maintain stability in a system by counteracting any deviation from a set point, while positive feedback amplifies or enhances the deviation from the set point. Negative feedback loops help regulate processes in the body, such as temperature control, while positive feedback loops are less common and tend to lead to a change in the system.
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∙ 10y agoIn an amplifier, gain is usually controlled by means of negative feedback, in which a small part of the output signal is fed back to the input to cancel out part of the input signal. This stabilizes the amplifier and linearizes it.
In an oscillator, some of the output is fed back to the input so as to add to the input. This makes it unstable, making it oscillate. Desirable in an oscillator, but undesirable in an amplifier.
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