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40. Frequency Response of CE/CS Amplifiers Considering High Frequency Models of BJT and MOSFET (Part A)

40. Frequency Response of CE/CS Amplifiers Considering High Frequency Models of BJT and MOSFET (Part A)

The chapter delves into the frequency response of Common Emitter (CE) and Common Source (CS) amplifiers taking into account the high frequency models of BJTs and MOSFETs. It elaborates on the impact of capacitances associated with these transistors on their frequency response, mainly focusing on Miller's theorem to calculate effective capacitances. Additionally, it discusses special RC circuits and offers numerical examples to reinforce the concepts presented.

Sections

Frequency Response Of CE/ CS Amplifiers Considering High Frequency Models Of BJT And MOSFET (Part A)

This section explores the frequency response of Common Emitter (CE) and Common Source (CS) amplifiers, focusing on the impact of high-frequency models of BJT and MOSFET transistors.

40.1 Section Overview

Start current section content and materials

40.1.1 Introduction

This section introduces the frequency response of Common Emitter (CE) and Common Source (CS) amplifiers, highlighting the impact of associated capacitances and the necessity to apply Miller's theorem for analysis.

40.1.2 Overall Plan

This section outlines the overall plan for analyzing the frequency response of Common Emitter (CE) and Common Source (CS) amplifiers considering high-frequency models of BJTs and MOSFETs.

40.1.3 Recapitulation of Frequency Response

This section discusses the frequency response of common emitter (CE) and common source (CS) amplifiers while introducing high-frequency models of BJT and MOSFET transistors.

40.1.4 Need for High Frequency Analysis

This section discusses the importance of high-frequency analysis in the frequency response of common emitter (CE) and common source (CS) amplifiers, emphasizing the impact of transistor capacitances.

40.1.5 Generalized Model of Amplifiers

This section discusses the frequency response of Common Emitter (CE) and Common Source (CS) amplifiers, focusing on the effects of high-frequency models for BJTs and MOSFETs.

40.1.6 Miller's Theorem

This section discusses Miller's Theorem and its implications for analyzing frequency response in common emitter and common source amplifiers.

Learning Objectives

  • The frequency response of CE and CS amplifiers is significantly influenced by capacitances associated with BJTs and MOSFETs.

  • Miller's theorem is crucial for determining the effective capacitance in frequency response analysis.

  • Understanding the frequency response in specific circuit configurations including RC circuits is essential for accurate amplifier design.

Key Concepts

Frequency Response

The behavior of an amplifier with respect to the output signal as the input frequency varies.

Miller's Theorem

A technique used to simplify circuits with feedback by splitting a single bridging capacitance into two equivalent capacitances affecting the input and output.

Common Emitter Amplifier

A configuration of bipolar junction transistor (BJT) that provides voltage amplification and is used in various amplifier designs.

Common Source Amplifier

A configuration of a MOSFET that similarly provides voltage amplification, and operates under analogous principles to the common emitter format.

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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