9

Feedback Amplifier

Outline

9-1 Introduction

9-2 Conceptual Development Through Block Diagrams

9-3 Properties of Negative Feedback

9-4 Calculations of Open-Loop Gain, Closed-Loop Gain and Feedback Factors

9-5 Topologies of the Feedback Amplifier

9-6 Effect of Feedback on Gain, Input and Output Impedances

9-7 Practical Implementation of the Feedback Topologies

9-8 Sensitivity

9-9 Bandwidth Stability

9-10 Effect of Positive Feedback

Objectives

In this chapter we will address the concept of feedback. Feedback is the fundamental concept in the design of a stable amplifier and an unstable oscillator circuit. Beginning with the conceptual development of feedback through block diagrams, this chapter explains both negative and positive feedback, ...

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