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37. Frequency Response of CE and CS Amplifiers (Part C)

37. Frequency Response of CE and CS Amplifiers (Part C)

The chapter discusses the frequency response of common source (CS) and common emitter (CE) amplifiers, including their equivalent small signal models and how to derive their output characteristics. The interaction between C-R and R-C circuits is analyzed to determine cutoff frequencies and gain, emphasizing the relationships between pole locations in the transfer function and the frequency response in the s-domain. Additionally, the importance of coupling capacitors in amplifier design is highlighted, stressing the need for numerical examples and design guidelines in subsequent lessons.

Sections

Frequency Response of CE and CS Amplifiers (Part C)

This section explores the frequency response of Common Emitter (CE) and Common Source (CS) amplifiers, detailing the relationship between amplifier circuits and their frequency responses.

37.1 Section Overview

Start current section content and materials

37.1.1 Introduction

This section introduces the frequency response of common-source (CS) and common-emitter (CE) amplifiers, focusing on their circuit configurations and operational principles.

37.1.2 Common Source Amplifier Circuit

The common source amplifier circuit is analyzed for its frequency response, connecting its components to the generalized model of analog circuits.

37.1.3 Small Signal Equivalent Circuit

This section discusses the concept of the small signal equivalent circuit in amplifiers, focusing on its significance and application in analyzing the frequency response of common source and common emitter amplifiers.

37.1.4 Thevenin Equivalent and Circuit Translation

This section discusses Thevenin's equivalent circuit and its application in analyzing amplifier circuits.

37.1.5 Output Resistance and Capacitance

This section covers the frequency response and modeling of common source and common emitter amplifiers, incorporating concepts of output resistance and capacitance.

37.1.6 Frequency Response of the Amplifier

This section covers the frequency response of amplifiers by analyzing the Common Source (CS) and Common Emitter (CE) amplifier configurations, detailing how different components contribute to cutoff frequencies and gain.

37.1.7 Gain Plot and Phase Plot

This section discusses the frequency response of amplifiers, detailing the gain and phase plots derived from common source and common emitter amplifiers.

37.1.8 Common Emitter Amplifier Overview

The common emitter amplifier is characterized by its frequency response and the impact of capacitive and resistive components in shaping its performance.

37.1.9 Frequency Response of Common Emitter Amplifier

The section elaborates on the frequency response of the common emitter amplifier, detailing its circuit configuration and relationships between components that affect gain and cutoff frequencies.

37.1.10 Cell Biased Common Emitter Amplifier

This section discusses the frequency response of the Cell Biased Common Emitter amplifier, exploring its circuit behavior and impact on gain and cutoff frequencies.

37.1.11 Summary of Today's Class

The summary covers the exercise on analyzing frequency response in Common Emitter (CE) and Common Source (CS) amplifiers by mapping their circuits to a unified model.

37.1.12 Pending Items to be Covered

This section outlines the topics and concepts still pending discussion in relation to frequency response of amplifiers.

Learning Objectives

  • The unified model of amplifiers can be constructed using C-R and R-C circuits to evaluate their frequency response.

  • The location of poles in transfer functions directly relates to cutoff frequencies in frequency responses.

  • Cutoff frequencies can be influenced by component values such as capacitors in the amplifier's input and output stages.

Key Concepts

Frequency Response

The output behavior of an amplifier circuit over a range of frequencies, characterized by its gain and phase characteristics.

Unified Model

A representation of an amplifier that combines the effects of passive components (resistors and capacitors) with the active components to predict behavior in frequency response analysis.

Cutoff Frequency

The frequency at which the output power of the amplifier is reduced to half of its maximum value, critical for determining the bandwidth of the amplifier.

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
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