Feedback in which the feedback signal is out of phase with the input signal. Also called DEGENERATIVE FEEDBACK.
a homeostatic mechanism where the change in a physiological variable triggers a response which counteracts the initial fluctuation. (cf. positive feedback)
The type of feedbacks used in a closed loop system where the output value is inverted and combined with the input to be used to stabilize or improve system characteristics.
Feedback that slows a process down or reverses it.
A type of feedback in which a perturbation to a system causes a damping of the process, and thus opposes itself.
A feedback signal 180° out of phase with an amplifier input signal. Used to increase amplifier stability, bandwidth and input impedance. Also reduces distortion.
See feedback system.
Principle that deviation of a variable from a desired value results in actions to correct the change. Widespread use in body, e.g. baroreceptor reflex, mechanisms for control of hormonal secretion, body temperature, etc. Compare positive feedback.
regulatory process that reduces the output of a system, such as the action of heat on a thermostat to limit the output of a furnace.
feedback applied to a system in such a way that it tends to reduce the output
feedback in opposite phase with (decreasing) the input
a loop that returns a signal in the opposite direction of an input so that the system can be stable
The feeding of a small amount of an amplifier's output back to its input out of phase, the purpose is to cancel out some of the distortion (notably even harmonics) the amplifier may introduce.
The practice of returning some amplifier output to its input, but at 180 degrees out of phase. This has the tendancy to increase amplifier stability while reducing distortion.
Feedback fron the output of an analogue circuit that tends to oppose the input. This has the effect of stabilising the circuit.
An amplifier circuit configured so that the output signal is fed back to be compared with the input signal and any error signals cancelled. Easier to imagine than to achieve the desired results without unwanted side effects.
In all amplifiers, a part of the output signal that is fed back and added to the input signal out of phase, somewhat reducing the gain, limiting distortion, and imparting stability. Negative feedback, when used properly, can also improve frequency response. At higher frequencies, the feedback may not be fast enough, and the result will be increased transient intermodulation distortion. Under most conditions, this will not be audible. Feedback may be used "locally," in sections of an amplifier, or "generally," to control the response of the whole unit. See also TIM.
A sequence of interactions that damps or reduces the response to an initial perturbation. For example, consider a surface that is subjected to an increase in incoming radiation. This change in the energy balance produces an increase in temperature which, by virtue of the Stefanâ€“ Boltzmann law, results in an increase in the radiation emitted by the surface. Thus, the interaction by temperature and radiation acts to partially counteract the original perturbation. Compare positive feedback.
Recycling of a signal that is 180° out of phase with the input to decrease amplification. Used in linear circuits to stabilize performance and minimize distortion.
A process that results in a reduction in the response of a system to an external influence. For example, increased plant productivity in response to global warming would be a negative feedback on warming, because the additional growth would act as a sink for CO2, reducing the atmospheric CO2 concentration.
Signal from output of amplifier or electronic network applied to input in anti-phase (hence negative feedback) to reduce distortion and noise and to flatten or otherwise shape frequency response.
The practice of returning some of an amplifier's, or amplifier stage's, output to its input 180 degrees out of phase. This has a tendency to reduce distortion and make an amplifier more stable. Too much reliance on negative feedback results in very high IM (intermodulation distortion) readings, and poor sonic performance.
Feedback which results in decreasing the amplification.
The return of a portion of the output signal to the input such that it is out pf phase with the input signal. A type of feedback in which the feedback signal is180° out of phase with the amplifier input signal.
Negative feedback (shortened to NFB) is a type of feedback in which the system responds in an opposite direction to the perturbation. It is a process of feeding back to the input a part of a system's output, so as to reverse the direction of change of the output. This tends to keep the output from changing, so it is stabilizing and attempts to maintain constant conditions.