VLSI Interview Questions
Questions Answers Views Company eMail

Tell me how BJT works.

2 7524

what is Early effects and their physical origin.

1 4137

what is short Channel effect.

2 7386

How about voltage source?

2024

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

1939

Explain how MOSFET works?

3018

Explain the various MOSFET Capacitances & their significance ?

Infosys,

1 6760

Explain the sizing of the inverter?

Intel,

1 8123

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

Infosys,

2780

What is Noise Margin? Explain the procedure to determine Noise Margin?

Amkor, Cisco, Infosys, Intel,

4 33464

Give the expression for CMOS switching power dissipation?

Infosys,

2 11673

what is body effect?

1 5990

Describe the various effects of scaling?

Infosys,

4547

What happens to delay if you increase load capacitance?

Infosys,

3 18374

What are the different limitations in increasing the power supply to reduce delay?

2 8291


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Un-Answered Questions { VLSI }

Draw the timing diagram for a SRAM Read. What happens if we delay the enabling of Clock signal?

907


Explain what is the use of defpararm?

880


Differences between Array and Booth Multipliers?

3765


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

2716


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

973


What is look up table in vlsi?

750


why is the number of gate inputs to CMOS gates usually limited to four?

1047


Cross section of a PMOS transistor?

4496


What does the above code synthesize to?

2267


Draw a transistor level two input NAND gate. Explain its sizing (a) considering Vth (b) for equal rise and fall times

1379


For f = AB+CD if B is S-a-1, what are the test vectors needed to detect the fault?

1008


Implement a 2 I/P and gate using Tran gates?

3726


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

3038


Draw a CMOS Inverter. Explain its transfer characteristics

896


What are the various regions of operation of mosfet? How are those regions used?

839