Feedback Amplifiers and Stability
G. Waterworth · 1988
Feedback is the combining of a portion of the output signal of an amplifier with the input signal. Negative feedback is the process of coupling the output with the input such that it cancels some of the input signal. The advantages to be gained by using negative feedback are as follows: (a) An increase in the input resistance, depending on the feedback type. (b) A reduction in the output resistance, depending on the feedback type. (c) Stabilisation against amplifier parameter variations. (d) Increased bandwidth (i.e. improved frequency response). (e) Improved linearity and reduced distortion. (f) Reduction in noise.