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

VLSI Interview Questions

Questions Answers Views Company eMail

Explain CMOS Inverter transfer characteristics?

ADS,

3924

Explain sizing of the inverter?

Infosys,

4428

How do you size NMOS and PMOS transistors to increase the threshold voltage?

4 29564

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

2461

Give the expression for CMOS switching power dissipation?

Cypress Semiconductor,

2 8325

What is Body Effect?

CG CoreEL, Cisco, TA,

2521

What happens to delay if you increase load capacitance?

Google,

1 3657

What are the limitations in increasing the power supply to reduce delay?

Infosys,

2 13514

How does Resistance of the metal lines vary with increasing thickness and increasing length?

Infosys,

3 13609

What happens if we increase the number of contacts or via from one metal layer to the next?

Infosys,

1 7571

Give the various techniques you know to minimize power consumption?

5 13095

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

1 4677

What happens if we use an Inverter instead of the Differential Sense Amplifier?

3004

What is the critical path in a SRAM?

3198

In a SRAM layout, which metal layers would you prefer for Word Lines and Bit Lines? Why?

Infosys,

4128

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Un-Answered Questions { VLSI }

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

3448

For CMOS logic, give the various techniques you know to minimize power consumption

1410

What are the different measures that are required to achieve the design for better yield?

1218

what is the use of defpararm?

1150

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)

1204

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

1204

How about voltage source?

2271

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

2104

Draw the SRAM Write Circuitry

1189

Why do we gradually increase the size of inverters in buffer design? Why not give the output of a circuit to one large inverter?

1299

What happens if we use an Inverter instead of the Differential Sense Amplifier?

3314

Explain how binary number can give a signal or convert into a digital signal?

1127

Give various factors on which threshold voltage depends.

1306

What does it mean “the channel is pinched off”?

1358

Explain what is slack?

1073

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