VLSI Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

VLSI Interview Questions

Questions Answers Views Company eMail

How can you construct both PMOS and NMOS on a single substrate?

IBM, Intel,

4989

What happens when the gate oxide is very thin?

Intel,

3 14147

What is setup time and hold time?

Intel,

1 6338

Write a pseudo code for sorting the numbers in an array?

Intel,

2 14868

What is pipelining and how can we increase throughput using pipelining?

Intel,

1 5231

Explain about stuck at fault models, scan design, BIST and IDDQ testing?

Intel,

3 13384

What is SPICE?

Intel,

4 17767

Differences between IRSIM and SPICE?

Intel,

5445

Differences between netlist of HSPICE and Spectre?

Intel,

1 9011

What is FPGA?

Intel,

7 14964

Draw the Cross Section of an Inverter? Clearly show all the connections between M1 and poly, M1 and diffusion layers etc?

Intel,

3380

Draw the Layout of an Inverter?

Intel,

2508

If the current thru the poly is 20nA and the contact can take a max current of 10nA how would u overcome the problem?

Intel,

1 7059

Implement F = AB+C using CMOS gates?

Intel,

2 11496

Working of a 2-stage OPAMP?

Intel, Tata Elxsi,

3194

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Un-Answered Questions { VLSI }

Give the cross-sectional diagram of the cmos.

1002

Why does the present vlsi circuits use mosfets instead of bjts?

1311

How does a Bandgap Voltage reference work?

3916

Draw Vds-Ids curve for a MOSFET. Now, show how this curve changes considering Channel Length Modulation.

1213

Explain how MOSFET works?

3247

For an AND-OR implementation of a two input Mux, how do you test for Stuck-At-0 and Stuck-At-1 faults at the internal nodes? (You can expect a circuit with some redundant logic)

1282

6-T XOR gate?

4257

Given a layout, draw its transistor level circuit. (I was given a 3 input AND gate and a 2 input Multiplexer. You can expect any simple 2 or 3 input gates)

1206

What are the different design techniques required to create a layout for digital circuits?

1050

What types of CMOS memories have you designed? What were their size? Speed?

4665

What is Latch Up? Explain Latch Up with cross section of a CMOS Inverter. How do you avoid Latch Up?

1349

For a single computer processor computer system, what is the purpose of a processor cache and describe its operation?

2407

Describe the various effects of scaling?

4796

Design an 8 is to 3 encoder using 4 is to encoder?

1338

How does Vbe and Ic change with temperature?

3522

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