20 Facts About Positive feedback

Positive feedback is a process that occurs in a feedback loop which exacerbates the effects of a small disturbance.

Mathematically, positive feedback is defined as a positive loop gain around a closed loop of cause and effect.

That is, positive feedback is in phase with the input, in the sense that it adds to make the input larger.

Positive feedback is used in digital electronics to force voltages away from intermediate voltages into '0' and '1' states.

Such systems can give rich qualitative behaviors, but whether the feedback is instantaneously positive or negative in sign has an extremely important influence on the results.

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The idea of positive feedback was already current in the 1920s with the introduction of the regenerative circuit.

One problem for amplifier designers who use negative Positive feedback is that some of the components of the circuit will introduce phase shift in the Positive feedback path.

One of the corollaries of the Schmitt trigger's use of positive feedback is that, should the input voltage move gently down again past the same threshold, the positive feedback will hold the output in the same state with no change.

The flip-flop uses a pair of amplifiers, transistors, or logic gates connected to each other so that positive feedback maintains the state of the circuit in one of two unbalanced stable states after the input signal has been removed, until a suitable alternative signal is applied to change the state.

Audio feedback is a special kind of positive feedback which occurs when a sound loop exists between an audio input and an audio output .

Principles of audio Positive feedback were first discovered by Danish scientist Søren Absalon Larsen.

Positive feedback is a well studied phenomenon in gene regulation, where it is most often associated with bistability.

Positive feedback occurs when a gene activates itself directly or indirectly via a double negative feedback loop.

Positive feedback plays an integral role in cellular differentiation, development, and cancer progression, and therefore, positive feedback in gene regulation can have significant physiological consequences.

Positive feedback can occur in other forms of cell signaling, such as enzyme kinetics or metabolic pathways.

Positive feedback loops have been used to describe aspects of the dynamics of change in biological evolution.

Winner described gifted children as driven by positive feedback loops involving setting their own learning course, this feeding back satisfaction, thus further setting their learning goals to higher levels and so on.

Programs such as Facebook and Twitter depend on positive feedback to create interest in topics and drive the take-up of the media.

Some Positive feedback mechanisms act in relative isolation to the rest of the climate system while others are tightly coupled.

The main negative Positive feedback comes from the Stefan–Boltzmann law, the amount of heat radiated from the Earth into space is proportional to the fourth power of the temperature of Earth's surface and atmosphere.