VLSI Interview Questions
Questions Answers Views Company eMail

what is conductance and valence band?

1 3106

What is Fermi level?

5 4548

How does Vbe and Ic change with temperature?

Qualcomm,

1707




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

1125

what is Channel length modulation?

Intel,

1 1443

what is the doping?

5 3052

How does a pn junction works?

Wipro,

1 3583

What is the depletion region?

1 2877




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

839

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

Analog Devices,

4 8408

What is the build-in potential?

Wipro,

860

Tell me how MOSFET works.

1000

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

2 6491

How does a Bandgap Voltage reference work?

1759

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

1580


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Un-Answered Questions { VLSI }

What is pipelining and how can we increase throughput using pipelining?

2295


What happens if we delay the enabling of Clock signal?

852


Calculate rise delay of a 3-input NAND gate driving a 3-input NOR gate through a 6mm long and 0.45m wide metal wire with sheet resistance R = 0.065 / and Cpermicron= 0.25 fF/m. The resistance and capacitance of the unit NMOS are 6.5k and 2.5fF. Use a 3 segment -model for the wire. Consider PMOS and NMOS size of reference inverter as 2 and 1 respectively. Use appropriate sizing for the NAND and NOR gate.

2350


Describe the various effects of scaling?

2877


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

2874


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

788


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

1538


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

1187


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

759


What types of high speed CMOS circuits have you designed?

1167


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

1398


What work have you done on full chip Clock and Power distribution? What process technology and budgets were used?

1773


What's the price in 1K quantity?

1303


If an/ap = 0.5, an/ap = 1, an/ap = 3, for 3 inverters draw the transfer characteristics?

1010


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

895