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63. Multi-Transistor Amplifiers: Cascode Amplifier (Contd.) – Numerical Examples (Part A)

63. Multi-Transistor Amplifiers: Cascode Amplifier (Contd.) – Numerical Examples (Part A)

The chapter focuses on Multi-Transistor Amplifiers, particularly the Cascode Amplifier, with an emphasis on numerical examples using both BJT and MOSFET technologies. Key aspects covered include the analysis of operating points, small signal parameters, voltage gain, and input capacitance. A detailed comparison of the cascode amplifier with common emitter amplifiers highlights the advantages of using cascode configurations.

Sections

Analog Electronic Circuits

This section discusses cascode amplifiers, particularly focusing on numerical examples using BJTs and MOSFETs.

63.1 Section Overview

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Lecture – 63 Multi-Transistor Amplifiers: Cascode Amplifier (Contd.) – Numerical Example (Part A)

This lecture focuses on the numerical analysis of cascode amplifiers using BJTs and MOSFETs, building on previous discussions about their construction and benefits over simpler configurations.

63.2 Section Overview

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Introduction

This section introduces cascode amplifiers, focusing on BJT and MOSFET configurations through numerical examples, illustrating their characteristics and operation.

63.3 Section Overview

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Coverage of Today's Lecture

Today's lecture focuses on the numerical examples of cascode amplifiers using BJTs and MOSFETs, illustrating their significance through comparative analysis.

63.4 Section Overview

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Numerical Problems on Cascode Amplifier using BJT

This section focuses on numerical examples of cascode amplifiers using BJTs, highlighting their construction, analysis, and performance metrics.

63.5 Section Overview

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63.5.1 Cascode Amplifier Circuit Description

The section discusses the cascode amplifier circuit using BJTs and MOSFETs, along with numerical analysis to illustrate their operation.

63.5.2 Bias Circuit and Operating Point

This section explores the biasing circuits and the operating points of multi-transistor amplifiers, notably cascode amplifiers using BJTs and MOSFETs.

63.5.3 Small Signal Parameters

This section focuses on the small signal parameters of cascode amplifiers, detailing calculations and numerical examples for both BJT and MOSFET configurations.

Voltage Gain Analysis

This section discusses voltage gain analysis in cascode amplifiers, including numerical examples and comparisons with common emitter amplifiers.

63.6 Section Overview

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63.6.1 Output Voltage Gain Calculation

This section covers the method for calculating the output voltage gain of a cascode amplifier using both BJT and MOSFET configurations.

63.6.2 Input Capacitance Calculation

This section covers the calculation of input capacitance in cascode amplifiers and the factors that contribute to it.

Comparison with Common Emitter Circuit

This section discusses the advantages of cascode amplifiers over common emitter amplifiers, particularly focusing on gain and bandwidth.

63.7 Section Overview

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63.7.1 Voltage Gain Comparison

This section compares voltage gain between cascode amplifiers and simple common emitter amplifiers, emphasizing the importance of input capacitance on bandwidth.

63.7.2 Input Capacitance Impact on Bandwidth

This section discusses the significant role input capacitance plays in determining the bandwidth of cascode amplifiers in analog electronic circuits.

Summary

This section focuses on cascode amplifiers, specifically detailing numerical examples for both BJT and MOSFET configurations.

63.8 Section Overview

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Learning Objectives

  • The operation principles of cascode amplifiers and their configurations using BJTs and MOSFETs.

  • The methods for calculating operating points and small signal parameters of transistors within amplifier circuits.

  • The impact of input capacitance on bandwidth and overall gains in different amplifier configurations.

Key Concepts

Cascode Amplifier

A multi-transistor amplifier configuration that improves bandwidth and gain by stacking two amplifiers.

Operating Point

The DC conditions of an amplifier circuit, including voltage and current levels that ensure transistors operate in their desired regions.

Small Signal Parameters

Parameters such as transconductance (g_m) and output resistance (r_o) that define the behavior of transistors under small signal conditions.

Voltage Gain

The ratio of output voltage to input voltage in an amplifier, indicative of amplification capability.

Input Capacitance

Capacitance looking into the input of an amplifier, impacting frequency response and bandwidth.

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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