16.2. Analysis Of Simple Non–Linear Circuit Containing a MOSFET

So, dear students welcome back to this Analog Electronics Circuit. Myself Pradip Mandal from IIT Kharagpur, I am associated with E and ECE Department of the institute. So, we are going through the second module and so, it is continuation of that namely we are going through Analysis of non-linear simple non-linear circuit containing BJT and MOSFET. In the previous sub-module we have seen that the circuit containing BJT how to analyze it and today we will be going to similar kind of analysis, but containing MOSFET, and we will also see what will be the difference.

In this chunk, the speaker introduces the topic, stating that the focus will be on analyzing a simple non-linear circuit that contains a MOSFET. It serves as a follow-up to previous lessons on BJT circuits, highlighting that the method of analysis will be similar yet distinct due to the characteristics of the MOSFET.

Think of understanding how various car engines work. In a previous lesson, you learned about gasoline engines (BJTs), and now you're transitioning to learn about electric engines (MOSFETs). Similar principles apply, but specific components and functions differ.

So, let us see the basic circuit configuration. So, here we do have the example circuit, we called example circuit-1 and you see where we do have supply voltage. Main DC supply voltage V which is giving supply to the drain of the transistor through resistor R DD normally referred as load and at the gate we are applying V G.

This chunk describes the basic configuration of the MOSFET circuit. The main components are a supply voltage connected to the drain of the MOSFET, a resistor that acts as a load, and a gate voltage applied to control the transistor. This setup is crucial as it determines how the MOSFET will behave in the circuit.

Consider this circuit as a water system where V is the water supply, R is a pipe that controls the amount of water flow, and V G is the tap that controls how much water is allowed to flow through. By adjusting the tap (V G), you can control the flow to the output.

And, we are assuming that the device it is in saturation region which is equivalent to active region of operation of BJT; namely, in the channel if you see the drain end the channel pinch off it is happening. And if that condition is satisfied...

In this chunk, the speaker explains the operating condition of the MOSFET, specifically that it is in the saturation region. This means that enough voltage is applied to ensure that the channel for current flow is fully open. The characteristics of this operational region are crucial for understanding how the MOSFET behaves as an amplifier.

Imagine a full stadium (saturation region) where all the seats are filled, allowing a concert (current flow) to happen perfectly. If the stadium were only half full (not saturated), the concert wouldn't have the same energy or output.

And, we will be seeing that what will be the output for varying inputs and then from that we will be giving a giving any thought towards what may be the output variation whenever we are changing the input.

This section discusses how altering the input affects the output of the common source amplifier. It emphasizes that the output can be predicted based on patterns of input signals, particularly when examining the transfer characteristics derived from MOSFET operation.

Imagine a volume knob that adjusts the loudness of your music based on how much you turn it. If you turn it slightly, the increase may be small, but if you turn it a lot, the sound is much louder. Similarly, the output voltage changes in response to small and large input variations.

So, in this module namely week-2 modules, we are going through this non-linear circuit containing only one transistor and as I said that previously we have covered circuit containing one BJT. And, today we will be going through similar kind of circuit containing MOSFET one MOSFET...

This concluding section summarizes the analytical steps taken throughout the study of simple non-linear circuits featuring MOSFETs. It reiterates the differences between the equivalent circuit, analysis procedure, and the significance of the parameters involved, paving the way for future studies in more complex configurations.

It's like preparing a recipe where the previous steps were learning a similar dish (BJT) and now preparing a slightly different but related dish (MOSFET). Each recipe has unique flavor and preparation techniques, yet the core fundamentals of cooking remain the same.

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