VLSI Basic Interview Questions

In this post i am going to talk about few interview questions related to VLSI basics, which i have faced during my interviews..

1. Draw the cross sectional view of a basic cmos inverter

2. What is Noise margin?

3. What is Temperature Inversion?

4. What happens when you invert the supply of pmos and nmos of a cmos Inverter, such that pmos source is connected to VSS [ground] and nmos source is connected to VDD [Supply] ?

5. What are the types of power dissipation in CMOS cells?

Click here - Power dissipation in CMOS

6. Realize an inverter using only NAND cells.

       There may be many ways this can be done. Here i have given two ways in which inverter function can be realized using NAND cells.

1. One of the input is tied to the supply so that it is always 1. Another input can be either 0 or 1 to get 1 or 0 as output respectively.

2. Same input [either 0 or 1] is given to both the inputs of NAND gate to achieve inverter functionality.

7. What is a grey code?

8. What are the types of capacitances in a  cmos?

More questions and answers will be posted soon....