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93. Feedback system (Part-D)

93. Feedback system (Part-D)

This chapter delves into the analysis of feedback systems in analog electronic circuits, focusing on the output resistance changes associated with various feedback configurations. Key sections cover voltage and current amplifiers, detailing how output resistance is influenced by different factors such as source resistance and feedback network characteristics. The importance of recognizing ideal versus non-ideal conditions is emphasized throughout the chapter to ensure accurate circuit analysis.

Sections

Feedback System (Part-D)

This section explores the effects of feedback on the output resistance of voltage amplifiers and current amplifiers, emphasizing the significance of both ideal and non-ideal feedback conditions.

93.1 Section Overview

Start current section content and materials

93.1.1 Introduction to Feedback System

This section explores the concepts of feedback systems in voltage amplifiers, emphasizing the impact of feedback on input and output resistance.

93.1.2 Output Resistance and Feedback Connection

This section discusses the changes in output resistance resulting from feedback connections in analog voltage amplifiers and trans-conductance amplifiers.

93.1.3 Non-ideal Situations and Source Resistance

This section discusses the impact of non-ideal feedback situations on output resistance in electronic circuits.

93.1.4 Trans-Impedance Amplifier Feedback Configuration

This section outlines the feedback configuration of trans-impedance amplifiers, emphasizing the changes in output resistance due to feedback connections.

93.1.5 Output Resistance Change in Voltage Amplifiers

This section discusses how output resistance is affected in voltage amplifiers due to feedback connections.

93.1.6 Current Amplifier Configuration

This section covers the output resistance changes in different amplifier configurations, particularly focusing on current and voltage amplifiers under feedback conditions.

93.1.7 Trans-Conductance Amplifier Configuration

This section explores the output resistance of trans-conductance amplifiers and their behavior under different feedback configurations.

93.1.8 Numerical Examples

This section explores the impact of feedback connections on the input and output resistance of various amplifiers, supported by numerical examples.

Learning Objectives

  • Output resistance varies significantly based on feedback configuration and conditions.

  • Non-ideal factors, such as finite input and output resistances, critically affect circuit performance.

  • Understanding the principles of feedback can enhance the design and analysis of electronic circuits.

Key Concepts

Output Resistance

The equivalent resistance seen by the load connected to the output of a circuit, which influences the voltage gain.

Feedback Configuration

The arrangement of feedback in an amplifier which can be classified as series or shunt depending on how the feedback signal is combined with the input signal.

Voltage Amplifier

An amplifier that primarily increases the voltage level of a signal, typically characterized by its high input resistance and low output resistance.

Current Amplifier

An amplifier designed to increase the current level of a signal, usually involving feedback in a shunt configuration.

TransImpedance Amplifier

An amplifier that converts input current to output voltage, often used in sensor applications.

Practice Exercises

Total Questions

4

Estimated Time

8 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting