VLSI Interview Questions
Questions Answers Views Company eMail

what is conductance and valence band?

1 3912

What is Fermi level?

5 5549

How does Vbe and Ic change with temperature?

Qualcomm,

2059




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

1 1908

what is Channel length modulation?

Intel,

2 2500

what is the doping?

5 3966

How does a pn junction works?

Wipro,

2 4258

What is the depletion region?

1 3473




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

1 1194

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

Analog Devices,

4 9500

What is the build-in potential?

Wipro,

1115

Tell me how MOSFET works.

1240

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

2 8192

How does a Bandgap Voltage reference work?

2304

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

1801


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Un-Answered Questions { VLSI }

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

1028


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

2029


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

993


What is Body Effect?

1247


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

2352






What happens if we delay the enabling of Clock signal?

1096


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

1892


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

1560


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

3183


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

1620


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

1285


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

3492


Draw the Cross Section of an Inverter? Clearly show all the connections between M1 and poly, M1 and diffusion layers etc?

2120


Describe the various effects of scaling?

3469


What is the critical path in a SRAM?

1869