VLSI Interview Questions
Questions Answers Views Company eMail

Tell me how BJT works.

2 7560

what is Early effects and their physical origin.

1 4167

what is short Channel effect.

2 7428

How about voltage source?

2039

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

1967

Explain how MOSFET works?

3038

Explain the various MOSFET Capacitances & their significance ?

Infosys,

1 6795

Explain the sizing of the inverter?

Intel,

1 8152

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

Infosys,

2808

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

Amkor, Cisco, Infosys, Intel,

4 33533

Give the expression for CMOS switching power dissipation?

Infosys,

2 11726

what is body effect?

1 6019

Describe the various effects of scaling?

Infosys,

4575

What happens to delay if you increase load capacitance?

Infosys,

3 18436

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

2 8341


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Un-Answered Questions { VLSI }

What is Latch Up? Explain Latch Up with cross section of a CMOS Inverter. How do you avoid Latch Up?

1032


Cross section of a PMOS transistor?

4518


what is multiplexer?

897


How does Vbe and Ic change with temperature?

3240


For an AND-OR implementation of a two input Mux, how do you test for Stuck-At-0 and Stuck-At-1 faults at the internal nodes? (You can expect a circuit with some redundant logic)

997


For a NMOS transistor acting as a pass transistor, say the gate is connected to VDD, give the output for a square pulse input going from 0 to VDD

1207


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

1031


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

3013


What are the steps involved in designing an optimal pad ring?

951


What happens if we delay the enabling of Clock signal?

2062


Explain Process technology? What package was used and how did you model the package/system? What parasitic effects were considered?

823


What is Body Effect?

2295


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

3552


How can you construct both PMOS and NMOS on a single substrate?

4745


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

2395