\fˈiːdbak], \fˈiːdbak], \f_ˈiː_d_b_a_k]\
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By DataStellar Co., Ltd
By Henry Campbell Black
Part of a system output presented at its input.Feedback may be unintended. When used as a design feature,the output is usually transformed by passive components whichattenuate it in some manner; the result is then presented atthe system input.Feedback is positive or negative, depending on the sign withwhich a positive change in the original input reappears aftertransformation. Negative feedback was invented by Black tostabilise vacuum tube amplifiers. The behaviour becomeslargely a function of the feedback transformation and onlyminimally a function of factors such as transistor gain whichare imperfectly known.Positive feedback can lead to instability; it finds wideapplication in the construction of oscillators.Feedback can be used to control a system, as in feedbackcontrol.
By Denis Howe