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94. Feedback system (Part-E)

94. Feedback system (Part-E)

The chapter provides a comprehensive overview of feedback systems in analog electronic circuits, focusing on the voltage gain, input resistance, output resistance, and output voltage of feedback systems. It contrasts ideal and non-ideal feedback situations through numerical examples, illustrating how different parameters like gain and resistance interact in these contexts. Through various calculations, it emphasizes the impact of feedback on circuit performance, particularly in enhancing input resistance and modifying output resistance.

Sections

Feedback System (Part- E)

This section discusses the calculations necessary to analyze a feedback system, including input and output resistances, voltage gain, and output voltage.

94.1 Section Overview

Start current section content and materials

94.1.1 Numerical Example

This section discusses calculating voltage gain, input resistance, output resistance, and output voltage of a feedback system using numerical examples.

94.1.2 Case-1: Ideal Feedback Network

This section focuses on calculating the voltage gain, input resistance, output resistance, and output voltage of an ideal feedback network.

94.1.3 Case-2: Non-Ideal Feedback Network

This section addresses the characteristics and calculations involved in analyzing a non-ideal feedback network in analog electronic circuits.

Conclusion of Feedback System

This section summarizes the key aspects of feedback systems, including their voltage gain, input resistance, and output resistance.

94.2 Section Overview

Start current section content and materials

94.2.1 Summary of Concepts

This section explores feedback systems in analog electronic circuits, focusing on voltage gain, input resistance, output resistance, and output voltage calculations.

94.2.2 Final Remarks

This section discusses key findings on the feedback system within analog electronic circuits, including calculations of voltage gain, input and output resistance, and output voltage.

Learning Objectives

  • Feedback systems can significantly alter the voltage gain, input resistance, and output resistance of a circuit.

  • The desensitization factor plays a crucial role in determining the input and output characteristics of feedback systems.

  • Understanding both ideal and non-ideal feedback conditions is essential for accurately designing and analyzing circuits.

Key Concepts

Voltage Gain

The ratio of output voltage to input voltage in an amplifier, indicating how much the amplifier boosts the input voltage.

Input Resistance

The resistance faced by an input signal at the input terminals of a circuit, which can be enhanced by feedback.

Output Resistance

The resistance seen by the load connected at the output of the circuit, which can also be modified by feedback.

Desensitization Factor

A factor that describes how feedback affects the sensitivity of various parameters in a feedback system, calculated as (1 + βA).

Feedback Factor (β)

The portion of the output voltage that is fed back to the input of the amplifier.

Loop Gain

The product of forward gain and feedback factor, indicating the overall effectiveness of feedback in a system.

Practice Exercises

Total Questions

3

Estimated Time

6 min

Passing Score

70%

Instructions

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