VLSI Interview Questions
Questions Answers Views Company eMail

what is conductance and valence band?

1 2601

What is Fermi level?

5 3986

How does Vbe and Ic change with temperature?

Qualcomm,

1602

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

1011

what is Channel length modulation?

Intel,

1329

what is the doping?

5 2509

How does a pn junction works?

Wipro,

1 2998

What is the depletion region?

1 2417

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

730

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

Analog Devices,

4 7736

What is the build-in potential?

Wipro,

771

Tell me how MOSFET works.

912

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

2 5779

How does a Bandgap Voltage reference work?

1534

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

1494


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Un-Answered Questions { VLSI }

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

1270


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

1011


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

1664


What are the ways to Optimize the Performance of a Difference Amplifier?

787


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

1396


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

3121


Differences between IRSIM and SPICE?

2972


Explain sizing of the inverter?

2367


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

1899


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

1370


Basic Stuff related to Perl?

1281


Cross section of a PMOS transistor?

2791


Tell me how MOSFET works.

912


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

746


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

867