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77. Differential Amplifier : Analysis and Numerical Examples

77. Differential Amplifier : Analysis and Numerical Examples

The discussion focuses on the analysis of differential amplifiers, covering both small and large signal analysis. Key concepts include the operational modes, gain calculations, and practical implementations using BJT and MOSFET. Additionally, the chapter introduces various stimulus operating conditions and explains the input-output relationships in detail.

Sections

Analog Electronic Circuits

This section focuses on differential amplifiers, covering their analysis, operational modes, and small signal equivalent circuits using both BJTs and MOSFETs.

77.1 Section Overview

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Differential Amplifier: Analysis and Numerical Examples

This section covers the analysis of differential amplifiers, focusing on both small-signal and large-signal operations, including key concepts like differential mode gain and common mode gain.

77.2 Section Overview

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77.2.1 Introduction

This section introduces the concept of differential amplifiers, focusing on their analysis and key parameters related to circuit operation.

77.2.2 Overall Plan

This section outlines the overall plan for exploring differential amplifiers, focusing on circuit analysis and numerical examples.

77.2.3 Small Signal Equivalent Circuit of Differential Amplifier

This section discusses the small signal equivalent circuit of differential amplifiers, focusing on both BJT and MOSFET implementations.

77.2.4 Differential Mode Analysis

This section outlines the analysis of differential amplifiers, focusing on differential and common modes of operation and their corresponding gain.

77.2.5 Common Mode Analysis

This section focuses on the common mode and differential mode analyses of differential amplifiers, highlighting key concepts and their significance in circuit design.

77.2.6 Large Signal Analysis

This section focuses on analyzing the differential amplifier's large signal responses, exploring its operation in differential and common modes.

77.2.7 Numerical Examples

This section explores numerical examples related to the analysis of differential amplifiers, highlighting their operation modes and related gains.

Differential Amplifier Realization

This section covers the analysis and understanding of the differential amplifier, focusing on circuit realization, small signal analysis, and the implications of different modes of operation.

77.3 Section Overview

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77.3.1 Transistor Implementation

This section covers the implementation of differential amplifiers using transistors, focusing on circuit analysis, small signal equivalent circuits, and gain characteristics.

77.3.2 Differential Amplifier using BJT

This section delves into the analysis of differential amplifiers using BJTs, focusing on their operations, small-signal equivalent circuits, and key parameters like differential and common-mode gain.

77.3.3 Differential Amplifier using MOSFET

This section focuses on the analysis and operational characteristics of differential amplifiers using MOSFETs, contrasting them with BJTs, and includes discussions on small and large signal analysis.

Conventions of Amplifier Analysis

This section focuses on the conventions and methods of analyzing differential amplifiers, including differential and common mode operations.

77.4 Section Overview

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77.4.1 Input and Output Polarity

This section covers the analysis of differential amplifiers, focusing on their circuit behavior under differential and common mode operations.

77.4.2 Differential and Common Mode Input Signals

This section discusses the concepts of differential and common mode input signals, emphasizing their significance in the operation of differential amplifiers.

Conclusion

The section provides a synthesis of key concepts and findings related to differential amplifiers, emphasizing their significance in analog electronic circuits.

77.5 Section Overview

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Learning Objectives

  • Differential amplifiers can operate in differential mode and common mode, each providing different gain characteristics.

  • Small signal equivalent circuits are essential for analyzing the behavior of differential amplifiers under varying input conditions.

  • The concepts of input common mode range and output signal swing are critical for understanding differential amplifier limitations.

Key Concepts

Differential Mode

A mode of operation in which two input signals are applied differentially, allowing the amplifier to amplify the difference between them.

Common Mode

A mode of operation where identical signals are applied to both inputs of the amplifier, which should ideally not produce any output.

Input Common Mode Range

The range of input voltages within which the differential amplifier can function correctly without distortion.

Output Signal Swing

The maximum peak-to-peak output voltage that the differential amplifier can provide without clipping.

Small Signal Equivalent Circuit

A simplified model of the differential amplifier that neglects DC components and focuses on the AC response to small perturbations.

Practice Exercises

Total Questions

2

Estimated Time

4 min

Passing Score

70%

Instructions

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