VLSI Interview Questions
Questions Answers Views Company eMail

what is conductance and valence band?

1 3361

What is Fermi level?

5 4888

How does Vbe and Ic change with temperature?

Qualcomm,

1786




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

1329

what is Channel length modulation?

Intel,

1 1726

what is the doping?

5 3387

How does a pn junction works?

Wipro,

1 3821

What is the depletion region?

1 3079




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

899

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

Analog Devices,

4 8706

What is the build-in potential?

Wipro,

943

Tell me how MOSFET works.

1076

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

2 7394

How does a Bandgap Voltage reference work?

2000

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

1636


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Un-Answered Questions { VLSI }

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

905


Are you familiar with the term MESI?

1170


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

3399


Insights of a 4bit adder/Sub Circuit?

1899


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

1328


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

2921


What products have you designed which have entered high volume production?

1046


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

1058


Design an 8 is to 3 encoder using 4 is to encoder?

47


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

1942


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

2061


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

806


Draw the Layout of an Inverter?

1091


Explain sizing of the inverter?

2811


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

1111