File Name: digital electronics lab viva questions and answers .zip
Why it is called Excess-3 code? How many numbers used in Excess-3 code? What is Demorgans Law?
- Digital Electronics Lab Viva Questions
- Analog And Digital Electronics - ADE Practicals
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Nice collection of questions on Digital electronics. With an addition of objective question on digital electronics can make this article more effective. Digital techniques are useful because it is easier to get an electronic device to switch into one of a number of known states than to accurately reproduce a continuous range of values.
Digital Electronics Lab Viva Questions
Epitaxy means arranging atoms in single crystal fashion upon a single crystal substrate. What are the processes involved in photo lithography? These are important processes involved in photolithography. What is the purpose of masking in fabrication of IC? Masking is used to identify the location in which Ion-Implantation should not take place.
What lire the materials used for masking? What are the types of Photo etching? Wet etching and dry etching are the types of photo etching. What is diffusion process? What are doping impurities? Diffusion is a process in which impurities are diffused into the Silicon chip at C temperature What is Ion-Implantation process?
It is process in which the Si material is doped with an impurity by making the accelerated impurity atoms to strike the Si layer at high temperature. What are the various Silicon wafer Preparation What are the different types of oxidation? What is Isolation? It is a process used to provide electrical isolation between different components and interconnections. Give the different types of CMOS process? In n-well fabrication, n-well is protected with the resist material. Because, it should not be affected during Boron implantation.
Then Boron is implanted except n-well. The above said process is done using photo resist mask. This type of implantation is known as Channel-stop implantation. This is one type of oxide construction. It is used to reduce bird's beak effect. What is LDD? It is used for implantation of n-region in n-well process.
What is Twin-tub process? Why it is called so? Twin-tub process is one of the CMOS technologies. Two wells the other name for well is Tub are created in this process. So, because of these two tubs, this process is known as Twin-tub process.
What are the steps involved in twin-tub process? In Twin-tub process, Threshold voltage, body effects of n and p devices are independently optimized. What are the advantages of Twin-tub process? Advantages of Twin-tub process are 1 Separate optimized wells are available.
What is SOI? What is the material used as Insulator? SOI means Silicon-on-Insulator. In this process, a Silicon based transistor is built on an insulating material like Sapphire or SiO2.
What are the advantages and disadvantages of SOI process? Advantages of SOI process: 1. There is no well formation in this process. There is no field-Inversion problem. There is no body effect problem. Disadvantages of SOI process: 1. It is very difficult to protect inputs in this process. Device gain is low. The coupling capacitance between wires always exists. What are the advantages of CMOS process? What are the various etching processes used in SOI process?
What are the types are of interconnect? Interconnect means connection between various components in an IC. Types of Inter connect: 1. Metal Inter connect 2.
PolySilicon Inter connect 3. Local Inter connect. What is Silicide? The combination of Silicon and tantaleum is known as Silicide. It is used as gate material in Polysilicon Interconnect. What is Polycide? The combination of Silicide and Polysilicon is known as Polycide.
It is used as gate material. What is Stick diagram? The diagram which conveys the layer information through the use of various colours is known as Stick diagram. It is also the cartoon of a chip layout. What are the uses of Stick diagram? Give the various color coding used in stick diagram? Compare between CMOS and bipolar technologies. What is Body effect? The threshold voltage VTh is not a constant with respect to the voltage difference between the substrate and the source of MOS transistor.
This effect is called substrate-bias effect or body effect. What is Channel-length modulation? The current between drain and source terminals is constant and independent of the applied voltage over the terminals.
This is not entirely correct. The effective length of the conductive channel is actually modulated by the applied VDS, increasing VDS causes the depletion region at the drain junction to grow, reducing the length of the effective channel. What is Latch -up? Latch-up is a condition in which the parasitic components give rise to the establishment of low resistance conducting paths between VDD and VSS with disastrous results.
Careful control during fabrication is necessary to avoid this problem. What is demarcation line? Lambda design rules and micron rules are major types of layout design rules. What is Lay-out design rule? The rules followed to prepare the photo mask are known as Layout design rules. It checks layout against schematic diagram. It is very important to verify layout. This tool checks every occurrence of design rule list on layout.
Width, spacing of every metal line in layout are checked with this tool. What is instance? What is instancing?
Analog And Digital Electronics - ADE Practicals
Define Logic gates 2. What is the function of X- or and X-nor gates 3. What are universal gates? Why it is called so? Write the truth table for Ex-or gate and AND gate 5. What is a combinational circuit? Give example.
In which of the following base systems is not a valid number? Storage of 1 KB means the following number of bytes a b c d Ans:c. What is the octal equivalent of the binary number: a b c d Pick out the CORRECT statement: a In a positional number system, each symbol represents the same value irrespective of its position b The highest symbol in a position number system as a value equal to the number of symbols in the system c It is not always possible to find the exact binary d Each hexadecimal digit can be represented as a sequence of three binary symbols. The binary code of Digital computers are more widely used as compared to analog computers, because they are a less expensive b always more accurate and faster c useful over wider ranges of problem types d easier to maintain. Most of the digital computers do not have floating point hardware because a floating point hardware is costly b it is slower than software c it is not possible to perform floating point addition by hardware d of no specific reason.
What are dependent sources? Define unilateral circuit? What are the material used for inductance coil? Please send me interview questions On EEE. Differentiate between D. Shunt Motor and D. List examples of voltage source?
DOC DE LAB VIVA QUESTIONS Q.1 The NAND gate output will be low if the two inputs are (A) 0,0 (B) 0 digital electronics lab viva questions.
De Lab Viva Questions
Mechanical Engineering 1. MCQ Practice Tests. Timed Mock Tests. Online Quizzes. Technical Terms.