14.1.3. Overview of Discussion

Welcome back to this course on Analog Electronic Circuits, myself Pradip Mandal associated with E and ECE Department of IIT, Kharagpur. So, after our previous modules in week-1, now we are in week-2 and we are going to discuss about the BJT and MOS related circuits. So, we will start with Analysis of simple non-linear circuit containing one BJT and later we will be discussing about one MOS and so and so.

In this section, the instructor welcomes students to the new week and clarifies the focus of the discussion, which will involve analyzing circuits containing Bipolar Junction Transistors (BJTs) and Metal Oxide Semiconductor Transistors (MOSFETs). The aim is to understand how these components function within circuits, starting with BJTs and eventually moving on to MOSFET circuits.

Think of BJTs like different types of light switches in your house. This week, we will learn about one particular type of switch (the transistor) and how it can turn lights on and off (amplify signals) in an electronic circuit.

So, as I said that we will be analyzing non-linear circuit containing one BJT and the configuration will be discussing primarily it is common emitter configuration.

The instructor specifies that the common emitter configuration will be the primary focus for the analysis of non-linear circuits containing BJTs. This configuration is a popular choice in electronic designs for amplifying signals. The common emitter configuration refers to a BJT circuit arrangement where the emitter terminal is common to both input and output, allowing for effective signal amplification.

Imagine you are amplifying music using a speaker. The common emitter configuration is similar to how you might set up the music source (like your phone) with the speaker, ensuring the signal flows through the system in a way that enhances the sound you hear.

So, what we will be doing is that we will be focusing on input to output transfer characteristic of non-linear circuit.

This part of the lecture will focus on how input signals relate to output signals in the context of the BJT circuit being analyzed. Understanding these characteristics helps predict how the circuit will behave with varying input signals. It lays the groundwork for mastering signal amplification concepts, which will be crucial for the remaining discussions.

Think of this as adjusting the volume of a television. The input is your remote's volume button, and the output is how loud the TV actually sounds. By learning the relationship between the two, you get a better feel for how to control the sound in the room.

And then also we will be discussing about the signal amplification, how this non-linear circuit containing one transistor may be helping us to change the signal rather amplify the signal.

The process of signal amplification involves increasing the power, voltage, or current of a signal without altering its original form. This segment of the discussion will dive into how BJTs can be used as amplifiers in circuits. The understanding of signal patterns, behaviors, and the non-linear characteristics of BJTs will be essential to grasp the source of amplification.

Imagine trying to talk to a friend in a crowded restaurant. Sometimes you need to raise your voice (amplify your signal) to ensure they can hear you clearly. Similarly, transistors amplify electronic signals to allow them to be effectively transmitted or processed in a circuit.

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