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"Vlsi interview questions with answers pdf download"

Vlsi interview questions with answers pdf download pdf

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What is the difference between inertial and transport delays in Verilog? What is ITD, inverted temperature dependence? What does the setup time of a flip-flop depend upon? Come up with logic that counts number of 1s in a 7 bit wide vector. You can only use combinational logic. How does a substrate bias on a MOS transistor affect Vt? Divide a clock by 3. You have an input vector where on subsequent clock cycles you get a1,a2,a3,a4 values.

Youre given a black box which adds two input vectors and generates one output. Assume black box output latency input to output delay is two clock cycle. Design this circuit. If youre not satisfied with this product, any time..

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Go through any VLSI book from beginning to the end 2. If possible solve all the problems at the end of the chapter 3. Most basic question is draw digital gates using transistors, difference between bipolar and cmos , analog and digital why cmos 4. Go through the details on your project 5. Refresh your circuit theory, basic LCR circuit , transfer function Why must transistors be provided with bulk connections? What voltage levels are connected to a p-type substrate and an n-type well through these connections, and why?

To make the parasitic diodes reverse biased. What is their major purpose? How are design rules created? Such diagrams are especially useful in complex processses, such as DRAM processes.

Are you familiar with the term MESI? Are you familiar with the term snooping? Describe a finite state machine that will detect three consecutive coin tosses of one coin that results in heads.

In what cases do you need to double clock a signal before presenting it to a synchronous state machine? You have a driver that drives a long signalconnects to an input device.

At the input device there is either overshoot, undershoot or signal threshold violations, what can be done to correct this problem? For a single computer processor computer system, what is the purpose of a processor cache and describe its operation? Explain the operation considering a two processor computer system with a cache for each processor.

What are the main issues associated with multiprocessor caches and how might you solve it? Explain the difference between write through and write back cache. Have you studied busses? What types? Have you studied pipelining? List the 5 stages of a 5 stage pipeline. Assuming 1 clock per stage, what is the latency of an instruction in a 5 stage machine?

What is the throughput of this machine? How many bit combinations are there in a byte? When will you use a latch and a flipflop in a sequential design? Design a 1-bit fulladder using a decoder and 2orgates? You have a circuit operating at 20 MHz and 5 volt supply. What would you do to reduce the power consumption in the circuit- reduce the operating frequency of 20Mhz or reduce the power supply of 5Volts and why? In a SRAM circuit, how do you design the precharge and how do you size it?

Give two ways of converting a two input NAND gate to an inverter 2. Given a circuit, draw its exact timing response. I was given a Pseudo Random Signal Generator; you can expect any sequential ckt 3. What are set up timehold time constraints? What do they signify? Which one is critical for estimating maximum clock frequency of a circuit?

Give a circuit to divide frequency of clock cycle by two 5. Hint: Double the Clock 6. Suppose you have a combinational circuit between two registers driven by a clock. What will you do if the delay of the combinational circuit is greater than your clock signal?

You can t resize the combinational circuit transistors 7. The answer to the above question is breaking the combinational circuit and pipelining it. What will be affected if you do this? What are the different Adder circuits you studied?

Give the truth table for a Half Adder. Give a gate level implementation of the same. Draw a Transmission Gate-based D-Latch. Now, how do you convert it to XNOR? Without inverting the output How do you detect if two 8-bit signals are same? How do you detect a sequence ofarriving serially from a signal line? Explain RC circuit s charging and discharging. Explain the working of a binary counter. Describe how you would reverse a singly linked list.

What do each of those numbers mean? The numbers you see there are usually the width and the length of the devices channel dimensions drawn in the layout If given only one number it s the width combined with a default length 3 Why is the number of gate inputs to CMOS gates e.

To limit the height of the stack. As we all know, the number of transistor in the stack is usually equal to the number of input. The higher the stack the slower it will be. Why do CMOS gates dissipate close to zero static power? Why is the static power not exactly zero? Cool What is a transmission gate, and what is it used for typically?

Why do layout designers usually only specify drawn layers? What are the advantages and disadvantages of each? A polygon is a polygon and a pad is a pad. A pad can be easily edited and reshaped, however, it s off grid with 45 degree angle. Polygon is always on-grid, unless it s a copy and flip.

However, polygon is hard to edit and work with. What is astackedvia process? Via: a contact between two conductive layers. Contact:Opening in an insulating film to allow contact to an underlying electronic device. The placement of vias directly over the contacts or other,lower vias is known as stacked via. What is it used for?

Concurrent design Design reuse Predictable schedules Hello, my comments 1. What is the propagation delay of the longest path through the circuit? The LSB bit: a. Gets pushed out and disappears b. Is pushed to the MSB c.

Is moved to bit V[7d. All answers are possibly correct Question 8 What is a tri-state bus and what is it used for? A tri-state bus has 3 possible states: 0,1,Z and is used for bi-directional bus b. A tri-state bus has 3 signals only and is used for write control c. A tri-state bus has 3 possible states: 0,1,X and can indicate when the bus is in unknown state d. Ravi Great post and good answers, keep it up Chen Hi, I am looking for vlsi objective interview questions and answers , please help Amar Thanks to all but if i got answer for these question then it is better.

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