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

VLSI Interview Questions

Questions Answers Views Company eMail

Insights of a Tri-State Inverter?

Intel,

3 8983

Basic Stuff related to Perl?

Intel,

2815

Have you studied buses? What types?

Intel,

5 16967

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 ?

Intel,

4 14082

How many bit combinations are there in a byte?

Intel,

6 12038

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

Intel,

3 11686

Explain the operation considering a two processor computer system with a cache for each processor.

Intel,

2846

What are the main issues associated with multiprocessor caches and how might you solve them?

Intel,

1 9849

Explain the difference between write through and write back cache.

Intel,

2 19117

Are you familiar with the term MESI?

Intel,

1 11124

Are you familiar with the term snooping?

Intel,

1 10103

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

Intel,

1 18215

In what cases do you need to double clock a signal before presenting it to a synchronous state machine?

IBM, Intel, nvidia,

3 20829

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?

Intel,

4 16060

What are the total number of lines written by you in C/C++? What compiler was used?

Intel, Zensar,

1 5636

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Un-Answered Questions { VLSI }

For f = AB+CD if B is S-a-1, what are the test vectors needed to detect the fault?

1249

Implement a function with both ratioed and domino logic and merits and demerits of each logic?

3783

How to improve these parameters? (Cascode topology, use long channel transistors)

2182

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

1041

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

4658

Explain why present VLSI circuits use MOSFETs instead of BJTs?

1143

Insights of a 4bit adder/Sub Circuit?

3361

Explain the three regions of operation of a mosfet.

1096

what is multiplexer?

1158

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

3142

For a NMOS transistor acting as a pass transistor, say the gate is connected to VDD, give the output for a square pulse input going from 0 to VDD

1449

What is the difference between nmos and pmos technologies?

1109

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

3007

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

1332

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

1266

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