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

VLSI Interview Questions

Questions Answers Views Company eMail

If not into production, how far did you follow the design and why did not you see it into production?

Intel,

2100

Insights of an inverter. Explain the working?

Intel,

1 10294

Insights of a 2 input NOR gate. Explain the working?

Infosys, Intel,

1 3660

Insights of a 2 input NAND gate. Explain the working?

Intel,

1 8995

Implement F= not (AB+CD) using CMOS gates?

Intel,

1 5760

Insights of a pass gate. Explain the working?

Intel,

4979

Why do we need both PMOS and NMOS transistors to implement a pass gate?

INEL, Intel,

3 14698

What does the above code synthesize to?

Intel,

2606

Cross section of a PMOS transistor?

Intel,

4773

Cross section of an NMOS transistor?

Intel,

3 9942

What is a D-latch? Write the VHDL Code for it?

Intel,

3 22604

Differences between D-Latch and D flip-flop?

AIT, Intel, Sibridge Technologies,

17 65436

Implement D flip-flop with a couple of latches? Write a VHDL Code for a D flip-flop?

Intel,

6 20589

What is latchup? Explain the methods used to prevent it?

Intel,

2 9665

What is charge sharing?

Cypress Semiconductor, Intel,

2 13525

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Un-Answered Questions { VLSI }

In vlsi chip 1000s of transistors are dropped, specifically categorized. Which method is used to achieve this & how it is done practically?

1020

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

3732

Explain why is the number of gate inputs to cmos gates usually limited to four?

1501

Mention what are the two types of procedural blocks in Verilog?

1305

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

3144

Explain what is the use of defpararm?

1157

Explain what is scr (silicon controlled rectifier)?

1064

Describe a finite state machine that will detect three consecutive coin tosses (of one coin) that results in heads.

2841

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

2451

Differences between Array and Booth Multipliers?

4080

Write a program to explain the comparator?

1156

what is multiplexer?

1164

How logical gates are controlled by boolean logic?

1075

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

2458

Draw a CMOS Inverter. Explain its transfer characteristics

1185

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