Positive Feedback: This type of feedback occurs when the response we get is affirmative or approving. This feedback is important because it motivates us to keep doing things the same way. Negative Feedback: This feedback, on the other hand, occurs when we receive a negative or disapproving response.

Positive feedback systems in living things usually happen in response to a physiological stressor, such as blood clotting or childbirth. Negative feedback systems in living things continuously regulate critical body processes including temperature, pH, and hormone regulation to maintain homeostasis.

Homeostasis typically involves negative feedback loops that counteract changes of various properties from their target values, known as set points. In contrast to negative feedback loops, positive feedback loops amplify their initiating stimuli, in other words, they move the system away from its starting state.

If the feedback signal (A_V × B × V_out) has the same phase as the V_IN signal, the amplifier circuit has positive feedback. If the feedback signal has the opposite phase to the V_IN signal, the amplifier circuit has negative feedback.