NEETS Module 8, Chapter 1

POSITIVEFEEDBACKNETWORKFigure 1-17B.—Feedback uses in amplifiers.NTS080117BNTS080117CFigure 1-17C.—Feedback uses in amplifiers.NEGATIVEFEEDBACKNETWORKFigure 1-17D.—Feedback uses in amplifiers.Positive and negative feedback are accomplished in many ways, depending on the reasons requiringthe feedback. A few of the effects and methods of accomplishing feedback are presented next.Positive FeedbackNTS080117DAs you have seen, positive feedback is accomplished by adding part of the output signal in phasewith the input signal. In a common-base transistor amplifier, it is fairly simple to provide positivefeedback. Since the input and output signals are in phase, you need only couple part of the output signalback to the input. This is shown in figure 1-18.1-20