VLSI Interview Questions
Questions Answers Views Company eMail

what is conductance and valence band?

1 4336

What is Fermi level?

5 6198

How does Vbe and Ic change with temperature?

Qualcomm,

2331




If the substrate doping concentration increase, or temperature increases, how will Vt change? it increase or decrease?

1 2239

what is Channel length modulation?

Intel,

2 3184

what is the doping?

5 4526

How does a pn junction works?

Wipro,

2 4687

What is the depletion region?

1 3745




Tell me the parameters as many as possible you know that used to character an amplifier?

1 1493

What are the two types of noise of MOSFET, how to eliminate them?(Thermal and Flicker).

Analog Devices,

4 10451

What is the build-in potential?

Wipro,

1 1386

Tell me how MOSFET works.

1390

For a 0.18um and 0.8um technology MOSFET, which has a higher cutoff frequency?

2 8804

How does a Bandgap Voltage reference work?

2523

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

1959


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Un-Answered Questions { VLSI }

What types of I/O have you designed? What were their size? Speed? Configuration? Voltage requirements?

1438


What is the difference between the mealy and moore state machine?

60


What is the difference between nmos and pmos technologies?

72


What are the changes that are provided to meet design power targets?

72


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

1148






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

78


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

1675


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

1155


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

73


what is Slack?

77


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

3629


Explain how MOSFET works?

2250


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

75


Let A & B be two inputs of the NAND gate. Say signal A arrives at the NAND gate later than signal B. To optimize delay, of the two series NMOS inputs A & B, which one would you place near the output?

85


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

3433