VLSI Interview Questions
Questions Answers Views Company eMail

While using logic design, explain the various steps that r followed to obtain the desirable design in a well defined manner?

Intel,

1 6075

Why is OOPS called OOPS? (C++)

ARM, Intel,

1 4710

What is a linked list? Explain the 2 fields in a linked list?

Intel,

1 7286

Implement a 2 I/P and gate using Tran gates?

Intel,

3507

Insights of a 4bit adder/Sub Circuit?

Intel,

2839

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

Intel,

5 12193

Explain various adders and diff between them?

Intel,

1 4753

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

Intel,

3981

A circuit has 1 input X and 2 outputs A and B. If X = HIGH for 4 clock ticks, A = 1. If X = LOW for 4 clock ticks, B = 1. Draw a state diagram for this Spec?

Intel,

3 8581

Advantages and disadvantages of Mealy and Moore?

Intel,

2 39021

Id vs. Vds Characteristics of NMOS and PMOS transistors?

Brillient, Intel, ISRO,

1 15980

Explain the operation of a 6T-SRAM cell?

Intel,

4061

Differences between DRAM and SRAM?

Infosys, Intel, University, Wipro,

14 68142

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

Intel,

3223

Given a circuit and asked to tell the output voltages of that circuit?

Intel, Omega Healthcare,

1 3811


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Un-Answered Questions { VLSI }

Help with VHDL programming. Write a VHDL code for a D-Latch with clear input ?? (Hint: Set up a “Process” with appropriate sensitivity list to get the desired D-Latch with Clr working.) Inputs AND OUTPUTS: entity Lab4b is Port ( Clr, Clk, D : in STD_LOGIC; Q : out STD_LOGIC); end Lab4b;

1050


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)

714


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

938


Tell me how MOSFET works.

1926


Approximately, what were the sizes of your transistors in the SRAM cell? How did you arrive at those sizes?

684






What are the various regions of operation of mosfet? How are those regions used?

583


What is the difference between synchronous and asynchronous reset?

613


Explain what is slack?

635


Give a big picture of the entire SRAM Layout showing your placements of SRAM Cells, Row Decoders, Column Decoders, Read Circuit, Write Circuit and Buffers

630


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

613


Describe the various effects of scaling?

4313


What are the different design constraints occur in the synthesis phase?

679


Explain the three regions of operation of a mosfet.

620


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

794


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

1848