Transcription of Chapter 4 FEEDBACK in AMPLIFIERS - users.encs.concordia.ca
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Chapter 4 FEEDBACK in AMPLIFIERS - users.encs.concordia.ca
Created by: Rabin Raut, 1 2/11/2012 Chapter 4 FEEDBACK in AMPLIFIERS (Review Appendix for background on two-port networks) FEEDBACK implies feeding back ( , returning back) a part of the processed signal to the input side so as to enhance or diminish the input signal. When the input signal (current or voltage) is diminished, it is considered as negative FEEDBACK . When the input signal is enhanced, it is known as positive FEEDBACK . Negative FEEDBACK is employed in amplifying systems to achieve certain special characteristics that are not obtainable from the basic amplifier.
Created by: Rabin Raut, Ph.D. 2 2/11/2012 While the basic amplifier has a gain A (i.e., xo /xI), the overall gain of the feedback system xo /xs is Af which is A/(1 + A ).This gain is called the gain with feedback. The quantities A and Af could be any one of the four different kinds of function, i.e., (a) voltage gain, (b) current gain, (c) trans-resistance gain and (d) trans-conductance gain.
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