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,

4479

What happens when the gate oxide is very thin?

Intel,

3 12668

What is setup time and hold time?

Intel,

1 5427

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

Intel,

2 13737

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

Intel,

1 4346

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

Intel,

3 12043

What is SPICE?

Intel,

4 15743

Differences between IRSIM and SPICE?

Intel,

4940

Differences between netlist of HSPICE and Spectre?

Intel,

1 7980

What is FPGA?

Intel,

7 12351

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

Intel,

2851

Draw the Layout of an Inverter?

Intel,

2037

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 6061

Implement F = AB+C using CMOS gates?

Intel,

2 10063

Working of a 2-stage OPAMP?

Intel, Tata Elxsi,

2599

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Un-Answered Questions { VLSI }

What is the function of chain reordering?

614

What is the ideal input and output resistance of a current source?

2513

What are the steps involved in designing an optimal pad ring?

712

Insights of a 4bit adder/Sub Circuit?

2841

What is the function of tie-high and tie-low cells?

615

What is threshold voltage?

679

Explain the working of 4-bit Up/down Counter?

3981

What is Noise Margin? Explain the procedure to determine Noise Margin?

1973

What is Charge Sharing? Explain the Charge Sharing problem while sampling data from a Bus

780

Write a VLSI program that implements a toll booth controller?

3493

What is the critical path in a SRAM?

2612

What is the difference between the mealy and moore state machine?

583

Differences between Array and Booth Multipliers?

3537

Describe the various effects of scaling?

4314

Explain why present VLSI circuits use MOSFETs instead of BJTs?

645

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