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33. Common Source Amplifier (Part B)

33. Common Source Amplifier (Part B)

The chapter discusses the small signal equivalent circuit of the Common Source Amplifier, highlighting its key parameters like voltage gain, output resistance, and input resistance. It explores the mapping of the amplifier into both voltage and transconductance configurations, and addresses the effects of parasitic capacitances at high frequencies. Additionally, it provides a numerical example analyzing the gain and output swing of a common source amplifier circuit.

Sections

Analog Electronic Circuits

This section focuses on the Common Source Amplifier, detailing its small signal equivalent circuit and key parameters including voltage gain, output resistance, and input resistance.

33.1 Section Overview

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Prof. Pradip Mandal

This section delves into the small signal equivalent circuit of the Common Source Amplifier, exploring parameters such as voltage gain, output resistance, and input resistance.

33.2 Section Overview

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Department of Electronics and Electrical Communication Engineering

This section covers the small signal equivalent circuit and analysis of the common source amplifier, detailing its operation, key parameters, and responses.

33.3 Section Overview

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Indian Institute of Technology, Kharagpur

This section focuses on the analysis and principles underlying the Common Source Amplifier, emphasizing its small signal equivalent circuits and various performance parameters.

33.4 Section Overview

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Lecture – 33: Common Source Amplifier (Part B)

This section discusses the small signal equivalent circuit for the common source amplifier, including its parameters such as voltage gain, output resistance, and input resistance.

33.5 Section Overview

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33.5.1 Introduction

This section introduces the small signal equivalent circuit of the Common Source Amplifier, focusing on the analysis of its parameters.

33.5.2 Small Signal Equivalent Circuit

This section explains the small signal equivalent circuit of a Common Source Amplifier, emphasizing its parameters like voltage gain, output resistance, and input resistance.

33.5.3 Voltage Gain

This section focuses on the voltage gain of a common source amplifier, discussing its small-signal analysis, formulas, and output characteristics.

33.5.4 Output Resistance

This section discusses the output resistance in the context of the Common Source Amplifier and its significance in analog electronic circuits.

33.5.5 Input Resistance

This section explains the concept of input resistance in the context of Common Source Amplifiers, including its calculation and significance.

33.5.6 Voltage Model

The Voltage Model provides a framework for analyzing the small signal equivalent circuit of the Common Source Amplifier, emphasizing voltage gain, output resistance, and input resistance.

33.5.7 Trans Conductance Amplifier

The Trans Conductance Amplifier section explains the conversion of common source amplifiers to trans conductance amplifiers, highlighting their operational characteristics and significance.

33.5.8 High Frequency Considerations

This section discusses high-frequency considerations in common source amplifiers, including parasitic capacitances and their effects on amplifier performance.

33.5.9 Numerical Problem

This section presents the process for determining the gain of a Common Source Amplifier through a numerical example.

33.5.10 Performance Comparison

This section discusses the performance metrics of a Common Source Amplifier, comparing its voltage gain, output resistance, and input resistance with other amplifier types.

Conclusion

The conclusion synthesizes the key points of the common source amplifier, emphasizing its operational principles and importance in analog electronics.

33.6 Section Overview

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Learning Objectives

  • The small signal equivalent circuit of the Common Source Amplifier involves setting DC bias to zero and analyzing parameters like voltage gain and output resistance.

  • The amplifier can be represented as either a voltage amplifier or a transconductance amplifier, depending on the application.

  • In high-frequency scenarios, parasitic capacitances must be considered, and the Miller effect plays a significant role in input port capacitance.

Key Concepts

Voltage Gain

The ratio of the output voltage to the input voltage, represented mathematically as A = -gm * RD.

Transconductance

A measure of the control of the output current by the input voltage in a transistor, defined as gm = dID/dVGS.

Miller Effect

A phenomenon in which capacitance at the output of an amplifier appears to be increased at the input when considering feedback.