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VLSI Interview Questions
Questions Answers Views Company eMail

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

IBM, Intel,

4225

What happens when the gate oxide is very thin?

Intel,

3 12125

What is setup time and hold time?

Intel,

1 5178

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

Intel,

2 13405

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

Intel,

1 4031

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

Intel,

3 11446

What is SPICE?

Intel,

4 14966

Differences between IRSIM and SPICE?

Intel,

4658

Differences between netlist of HSPICE and Spectre?

Intel,

1 7666

What is FPGA?

Intel,

7 11565

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

Intel,

2670

Draw the Layout of an Inverter?

Intel,

1856

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 5698

Implement F = AB+C using CMOS gates?

Intel,

2 9601

Working of a 2-stage OPAMP?

Intel, Tata Elxsi,

2424


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Un-Answered Questions { VLSI }

Mention what are the different gates where Boolean logic are applicable?

497


What products have you designed which have entered high volume production?

1777


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

1802


Explain the operation of a 6T-SRAM cell?

3831


Cross section of a PMOS transistor?

4041






Explain what is slack?

473


Draw Vds-Ids curve for a MOSFET. Now, show how this curve changes with increasing Vgs.

466


You have a driver that drives a long signal & connects 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?

1968


What are the ways to Optimize the Performance of a Difference Amplifier?

1641


Explain the three regions of operation of a mosfet.

462


Insights of a 4bit adder/Sub Circuit?

2668


What transistor level design tools are you proficient with? What types of designs were they used on?

4373


what is Slack?

516


What was your role in the silicon evaluation/product ramp? What tools did you use?

2986


Process technology? What package was used and how did you model the package/system? What parasitic effects were considered?

2480