45.1.1. Introduction

Dear students, welcome back to our online NPTEL certification course. The topic of this course is Analog Electronic Circuit. Myself, Pradeep Mandal from E and ECE department of IIT Kharagpur. Today’s topic of discussion it is Common Collector and Common Drain Amplifiers, rather I should say it is continuation of this topic.

In this introductory chunk, Prof. Pradip Mandal greets students and sets the context for the course on Analog Electronic Circuits. He introduces himself and specifies that today's focus will be on Common Collector and Common Drain amplifiers, indicating that this discussion is a continuation of a previous lesson. This establishes continuity in learning and reinforces the connection to earlier topics.

Think of this as a continuation of a story. Just like in a book series where each book builds on the previous one, in this course, each lecture adds more complexity and depth to your understanding of analog circuits.

Today we are going to a little detail considering some practical circuit components also. So, what we have to cover today, as I said we have discussed the motivation part of the common source and sorry common collector and common drain amplifier, basic operation and biasing also it is done.

In this chunk, Prof. Mandal outlines the objectives for the current session by indicating that he will delve deeper into practical components of Common Collector and Common Drain amplifiers. He reiterates that the basic concepts and motivations for these amplifiers have already been discussed in earlier lectures, hinting that this session will build on that foundational knowledge with practical analysis.

Imagine learning to bake a cake. First, you learned about the recipe (the basic operation) and ingredients (biasing), and now in this session, you’ll be focusing on how to make adjustments for the icing and decoration (practical components) to enhance the final product.

And we are going to go a little detail of analysis of voltage gain and impedance, input capacitance, considering realistic biasing and their associated components.

Here, the instructor specifies that the session will focus on detailed analysis, covering key parameters like voltage gain, impedance, and input capacitance. He mentions that this analysis will take into account the realistic biases and components that affect the performance of the amplifiers, moving beyond idealized models to more practical applications.

Think of this section as tuning a musical instrument. Just like adjusting the strings of a guitar to get the right sound (realistic analysis of voltage gain and other factors), in the study of amplifiers, you adjust various components to ensure that they perform effectively under real-world conditions.

In fact, in the previous class we have discussed about the analysis of the circuit for voltage gain, impedance and input capacitance ignoring these components, and today we are going to see that what will be there you know consequences if we consider on a practical components.

Prof. Mandal reflects on the prior session where the analysis was done under ideal conditions, without the involvement of practical components. He emphasizes that this session will explore the practical consequences when real components are included in the analysis, thus linking theoretical concepts with practical implications.

This is similar to planning a road trip under perfect weather conditions (ideal analysis) versus actually facing traffic and weather changes (practical analysis). You’re adjusting your plans based on the real challenges you may encounter.

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