VLSI Passing Package & IMP Questions 6th Sem

Added: 2026-05-27

[00:00:01]Hello everyone.

[00:00:03]Welcome you all to this new video.

[00:00:06]So in this video I'm going to be discussing with the latest batch of VLSI design and testing passing package as most of you are demanding. And this time I've provided the passing package very early because we are having around 4 days for this exam and I thought that to provide if you if you if I provide early you would be getting a lot of time to be searching all the answers and practicing it very well. So I hope my passing package for embedded systems had helped you had helped you all. So in the with the same motive this passing package is created for you guys, okay? Those who are not studied till now and those who want to pass and score good, not only just passing but if you refer my passing packages you would be scoring very good marks, okay? So please please do watch the video till the end guys. Everybody do like this video.

[00:00:52]Please please everybody has to like this video. And those who have not subscribed it, please subscribe to our channel. So the subject code is EC602. 100% you will definitely pass if you study thoroughly without skipping any of these questions, okay? Some of them what they do is they would be filtering some questions from this also, okay? That thing should not be done because all of the question which I mentioned in the passing package are very important. If you sincerely practice these questions definitely you would be passing this subject, okay? So module wise passing package, okay? You could be scoring 65 plus if you thoroughly listen to me.

[00:01:26]So now let's get started with module one.

[00:01:29]In module one the first question is uh these questions are finalized from the previous year papers by taking some of them from the model papers and uh uh some of the backlog papers also of the of the previous semesters. So yeah, let's get started. Now first question, discuss various types of MOSFETs along with its physical structures and describe how it acts as a switch, okay?

[00:01:52]So this question had come in the previous year paper, okay?

[00:01:55]In my question paper it had come and I thought to keep this question. There are high chances that this question would be appearing, okay? So, that's why I've thought to keep it. Second one, this question is fixed, okay? There are high chances that this question would be definitely arriving, that is comparing C CMOS and N MOS logic, okay? Compare CMOS and N MOS logic.

[00:02:14]So, this is second one. Third one, explain the physical representation and working of transmission gates. So, this is also very important. Please go through it, practice it, try to search the answer and keep ready. Fourth one, discuss the combinational logic operation of two input CMOS NAND gate or NOR gate. Any one of them would be definitely asked, it is 100% sure, okay?

[00:02:37]So, you will need to be practicing it, okay? Either two input CMOS NAND gate or NOR gate. If you want the detailed explanation, it is available in my VLSI design and testing playlist, okay? For both the two input CMOS NAND and NOR, both two separate videos are there, so you could be going and watching it. You would be easily understanding it, it's very easy, okay?

[00:02:56]Fifth one, explain the physical representation of CMOS inverter along with its stick diagram. Stick diagram or layout, it's one in the same, okay? So, this is also very important, do practice it. Sixth one, illustrate different circuit representations used in digital circuit design along with the example.

[00:03:14]So, this had come in the previous year question paper, so that's why I thought to keep it. I don't know whether it's there this time in your syllabus or not, but still it was there in the previous year paper.

[00:03:24]Just now let me know in the comments whether this concept of digital circuit design is there in the syllabus or not. If it's there, then you need to be practicing it, okay? Yeah. So, in the seventh one, I've given some of the Boolean expressions.

[00:03:37]You need to be drawing the CMOS logic schematic diagrams, okay? So, these three are for your practice, okay? You could be practicing for more. There would be a lot of questions available in in my videos also I've solved a lot of questions. So, from that also you could be practicing it. So, these three questions I've kept it here. First is Y is equal to ABC + D bracket into E whole bar. Second one A into B + C + DE whole bar. And third one is Y is equal to A bar B + AB bar or Y XOR B. Okay? So, these three you need to be practicing it.

[00:04:10]You should be drawing the CMOS logic circuits. Okay? Yeah, so these are the questions from module one. I hope you have taken down.

[00:04:19]Now, let's get to module two.

[00:04:21]Module two first question.

[00:04:23]With a neat diagram, explain the working of NMOS enhancement mode transistor using various and under various voltage conditions. Okay? So, this was there in the previous year paper and I guess this is there in the model paper as well. And this is very important, guys. Okay? So, you need to be giving preference to this question. There are high chances that this would be 100% coming sure in the exam.

[00:04:46]Second one, explain the prevention of CMOS latch-up phenomenon in CMOS circuits. So, in the previous year they had asked the question related to noise margin. So, that's why I've not kept the concept of noise margin in this package because there are high chances that last time they had asked noise margin.

[00:05:03]So, this time there are high chances that they might be asking the question related to CMOS latch-up. Okay? Either noise margin or CMOS latch-up. Any one of them they would be asking. But I think that they would be asking CMOS latch-up. So, don't need to be studying noise margin. Okay? Yeah.

[00:05:17]Third one, derive the drain current equations in all the operating regions.

[00:05:21]Okay? Under inverter characteristics, there are five operating regions. For that we have five different drain currents you in all the five regions. You need to be deriving all of them. Okay? It's very important.

[00:05:34]Fourth one, explain the working of pseudo NMOS inverter. This is very important. This had come in the previous year paper. And I guess this is there in the model paper as well. So, that's why I've kept this here. Give preference to it. It's very easy. Okay? This might be coming for five to six marks, okay?

[00:05:48]Yeah. Let's get to the next question now.

[00:05:52]Fifth one.

[00:05:53]Find the expression for V out, that is the output voltage, in regions C and D of the CMOS inverter transfer characteristics, okay? So, they have mentioned us to be finding out the expression for voltage in the regions C and D. We know that totally there are five regions under a CMOS inverter DC characteristic plot. In that, specifically they mentioned region C and D, okay? Like this, the question would be definitely asked. They would be telling you to find the voltage at the specific regions, okay? So, this was there in the previous year paper. They had asked only for region C, but I had kept region C and D, both of them, okay?

[00:06:28]Just practice it. Both the regions have different parameters, so if you practice both the regions calculation, it would be very beneficial for you guys, okay? Sixth one is very important. 100% sure this question would be arriving, that is, define the threshold voltage, how does body effect influence the threshold voltage, and also mention the different design strategies to minimize the effect of body effect, okay? So, there are high chances and mark my words, this would be definitely coming in the exam. So, do practice it, okay? So, these are the questions from module two.

[00:07:01]Now, let's get to module three.

[00:07:03]Illustrate wafer processing, selective diffusion, and charge sharing, okay?

[00:07:09]Charge sharing or yield, any one of them would be asked, okay? I have not kept yield, I have kept charge sharing. So, no need to study yield, it's very easy.

[00:07:16]If you want, in the last moment you could be studying it, okay? But, give importance to these two, wafer processing and selective diffusion. This is repeated multiple times in the backlog paper, previous year paper, along in the model paper also it is there, so there are high chances that this time also they might be giving these two questions of explaining the concept of wafer processing and selective diffusion, okay? Second one, mention the purpose and key constraints of the layout design rules. One question related to layout design rules is fixed, okay? So, you you need to be practicing it. Third one, derive the equations of rise time, fall time, and delay time. This is very important, guys, okay? Please do practice it. I guess this question one derivation question from module three related to this rise, fall, and delay time would be asked, okay? They won't be asking all three. Any two of them they would be asking it for sure, okay? So, do practice it.

[00:08:08]Fourth one, explain the various capacitances in MOS transistor, okay?

[00:08:13]So, this comes comes under the concept of capacitance estimation. In that we are having some of the capacitances, and for some of the formulas related to that are already mentioned. So, please do practice it. There are high chances that this might be appearing in the exam.

[00:08:27]Fifth one, explain with neat diagram the process flow of fabricating the CMOS inverter using twin tub process, okay?

[00:08:35]So, this was there in the previous year paper. Uh this time I don't know whether they would be asking it since it was there in the previous year, so that's why I thought to keep it. So, yeah, do practice this as well. This is using twin tub process.

[00:08:45]Sixth one, define sheet resistance. So, this question related to sheet resistance and one layout problem would be definitely asked, so that's why be be ready for that. One is first you need read the definition of sheet resistance and explain the sheet resistance for the given layout for the given layer having length L and width W. They would be giving you one figure with one particular fixed length and width. Based on that you need to be evaluating that sheet resistance with the formula that is rho L by W, so that's there for sheet resistance. Based on that, uh you need to be calculating it and finding it out, okay? So, one problem related to the sheet resistance would be asked, so do practice it, okay?

[00:09:24]Module four.

[00:09:26]Now, let's get to module four. First question is design a 4:1 multiplexer using pass transistor logic. One multiplexer question using PTL would be definitely asked. Last time they had asked 2:1 multiplexer.

[00:09:39]First I had written 2:1 only, so that's why I've changed this time because they won't be asking 2:1. If they ask 2:1, they would be asking for five marks. That I guess they won't be asking it. But for 4:1, if they ask 4:1 marks using PTL, they would be asking around six to seven marks, okay? So do study it. It's very easy. If you understand it, this 4:1, easily you could be explaining for 2:1 as well, okay? Yeah.

[00:10:02]Second one, differentiate. This is very important. Differentiate between static and dynamic CMOS logic circuits along with the relevant diagrams, okay? You do study it. It is a fixed question. It is there in all the previous paper. If you want, you can check it out.

[00:10:16]Third one, draw the physical layout of two input NOR gate along with its Euler graph or Euler graph, I don't know what it's pronounced that. I'll call it Euler Euler graph. Also for the expression Y is equal to A plus B plus CD whole bar, okay? So one question related to layouts, I've already explained you in my videos how to draw the layouts for two input CMOS NOR NAND gate and all the expressions. Go and check it out. You would be understanding it very easily, okay? Yeah. Fourth one, design the following. So this is fixed because in the most of the papers cascade voltage shift logic CVSL, cascode voltage shift logic is 100% definite question. So 100% this would be arriving in the exam. Along with that, I've given the importance for the C square MOS logic, okay? So so for these two questions, the circuit diagrams, all the CMOS logic circuit diagrams, be ready, okay? CVSL would be definitely asked, okay?

[00:11:13]Now let's get to the next question, question number five. Describe the design and function of input output pads.

[00:11:20]Sixth one, explain the precharge and evaluation phase in the dynamic CMOS logic circuits, okay? So there are two phases as we know in the dynamic CMOS.

[00:11:30]One is in the positive cycle it is a pre-charged phase and when it comes towards the negative cycle when it drops down when it reaches zero it would be coming towards the evaluation phase, okay? So, those two evaluation phases with respect to dynamic circuits you need to be explaining and this is a very important question, okay? Please do practice it. Module five, let's get to module five now. I have kept only five questions, okay? If you study these five questions only there are high chances that all the five questions would be appearing in the exam with choices, okay? Because these all of them are very important. So, describe the behavior of two inverter bistable element. This one question is fixed 100% they would be asking it along with its voltage transfer characteristics VTC curve, okay? Do practice it. Next one, with a neat diagram explain the working of CMOS clocked JK latch. Again, this is 100% fixed they would be asking it using two input NOR gates, okay? NOR two gates or two input NOR gates. So, CMOS clocked JK latch very important. Explain the gate array design flow. Fourth one, this question they might be asking for five marks if they ask, okay? This is a small question, okay? With not much lengthy answer. Fourth one, what are the structure design design strategies and explain the different design rules under structure design strategies, okay? So, this is also a fixed question. Fifth one, explain the operation of SR latch using two input CMOS NAND gates along with its switch level diagram, okay? So, these two questions related to CMOS clocked JK latch and SR latch both of them would be arriving in the exam, okay? So, do practice it very well. It's very easy, okay? Videos would be available in my channel if you are not understanding it go and watch it. And also in all the videos description, also in this video's description I will be providing you the notes, okay?

[00:13:16]Detailed notes which would which would be very easy and accessible and go through that notes. Try to find the answers for these questions. Since there are four days time you need to be practicing it very well, okay?

[00:13:27]Take one day for finding all the answers, practice it, write and learn everything. If you write and learn, then only you would be understanding more and you would be remembering more while you while you write in the exam, okay? Write and learn, okay?

[00:13:40]Note down the key points, and these are the important questions from all the five modules. I hope this would be helpful for you guys. All the best to all.

[00:13:49]Subscribe to our channel if you have not subscribed yet. Like and share. Sharing is very important, guys, okay? Share this video to a huge number. All of them, those who are giving this exam, should be knowing about this passing package, because I know that how difficult it is for you guys to be handling over the academic part, because most of you in this semester they would be struggling over internships, projects, and all. They won't be getting time to study, okay? I know that, because I have also faced the faced this situation while I was in 6th sem. So, with that motive only, for you guys for you for you juniors, I provided this passing package, and I will be providing it in the future for all other subjects as well, okay? So, your job is to like this video, share share this video to a huge number, okay? Contribute something to me and by doing these things. And all the best to all the all the students. Do access this passing package, and do score well, okay? Don't carry a backlog. Do score well. Thank you.