38.1.2. Previous Discussions

Dear students, welcome back to this NPTEL online course on Analog Electronic Circuits. Myself Pradip Mandal from E and EC Department of IIT, Kharagpur. Today, we are going to continue the Frequency Response of Common Emitter and Common Source Amplifier and so it is primarily whatever the remaining topic, it was there we are going to cover today and will be mainly focusing on common emitter amplifier.

In this chunk, the professor introduces the lecture and sets the agenda for the session. The focus is primarily on the common emitter amplifier, which is a key concept in analog electronics. The lecture continues from previous discussions and aims to build on students' understanding by exploring advanced topics related to this amplifier type.

Imagine you're revisiting a storybook where each chapter builds on the previous ones. Just like a storyteller elaborates on characters and plot developments, the professor guides students through new technical concepts building on what they've already learned.

In the previous week we have discussed about common emitter amplifier with fixed bias and today we are going to discuss more about the self-biased common emitter amplifier.

Here, the professor reflects on past lessons, specifically focusing on two versions of the common emitter amplifier—one with a fixed bias and the other with self-bias. This establishes a clear continuity in learning, where new concepts expand upon previously covered material.

Think of learning to ride a bike. First, you master balance (the fixed bias) before moving on to learning how to adjust the gears for smoother rides (the self-bias). Each skill builds upon the last, enhancing your overall capability.

So, what we have today the overall plan; as I said that in the previous week we have discussed about the frequency response of CE amplifier for which we have detail discussion about R-C and C-R circuit.

The professor outlines the session's plan, which includes a recap of the frequency response of the common emitter amplifier. This establishes context as the students prepare to engage with new analyses related to different circuit configurations—R-C and C-R circuits— which are fundamental to understanding amplifier behavior.

Consider preparing for a presentation. You summarize past points to remind your audience of the context, making it easier for them to understand the new information you're about to unveil.

Today, we are going to discuss about the frequency response of common emitter amplifier with self-bias arrangement.

In today’s lecture, the aim is to delve into the frequency response of the common emitter amplifier configured with a self-bias arrangement. This specific setup is crucial because it influences how the amplifier operates across different frequencies, which is essential for practical applications.

Think of a cooking recipe where the ingredients change based on what's in season. This self-bias arrangement adapts the amplifier’s performance depending on the frequency, much like a recipe adapts to seasonal ingredients for the best taste.

From these numerical examples, we will get an idea that how to select the value of different capacitive components in the circuit. In fact, that will help us some design guidelines.

The professor emphasizes the importance of numerical examples in the learning process. By working through calculations and examples, students gain practical insights into selecting appropriate values for capacitive components, which are vital for effective amplifier design.

Just like a gardener learns which plants thrive in their climate by taking notes from their experiences (numerical examples), students gain insights into practical circuit design through hands-on calculations.

So, we need to just recapitulate some part of it, particularly the R-C circuit and C-R circuit analysis which it has been deployed for fixed bias circuit and then we will be moving to the common emitter amplifier with self-bias.

The introduction of recapitulation highlights the significance of reviewing prior knowledge. This consolidation aids students in understanding how the previously discussed R-C and C-R circuit analyses apply to the upcoming discussion on self-bias arrangements.

Consider revisiting the foundational concepts of a language before diving into poetry. Just as prior knowledge makes interpreting poetry easier, revisiting circuit analyses ensures that students are prepared for more complex ideas ahead.

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