Essay Term Paper

DEPARTMENT OF ELECTRONICS AND COMMUNICATION
ENGINEERING
SUBJECT CODE: EC1203
DIGITAL ELECTRONICS
(FOR THIRD SEMESTER ECE)

TWO MARK QUESTIONS-ANSWERS

PREPARED BY
Y.IREANEUS ANNA REJANI (AP/ECE)

Noorul Islam College of Engineering, Kumaracoil
Department of Electronics & Communication
Third semester
EC1203 Digital Electronics

Part - A
Unit – 1

1. Define binary logic?
Binary logic consists of binary variables and logical operations. The variables are designated by the alphabets such as A, B, C, x, y, z, etc., with each variable having only two distinct values: 1 and 0. There are three basic logic operations: AND, OR, and NOT.

2. What are the basic digital logic gates?
The three basic logic gates are
AND gate
OR gate
NOT gate
3. What is a Logic gate?
Logic gates are the basic elements that make up a digital system. The electronic gate is a circuit that is able to operate on a number of binary inputs in order to perform a particular logical function.
4.Give the classification of logic families
Bipolar

Saturated

RTL
ECL
IIL
TTL

Non Saturated

Unipolar

PMOS
NMOS
CMOS

Schottky TTL
DTL

5. Which gates are called as the universal gates? What are its advantages?
The NAND and NOR gates are called as the universal gates. These gates are used to perform any type of logic application.
6.Classify the logic family by operation?
The Bipolar logic family is classified into

Saturated logic
Unsaturated logic.
The RTL, DTL, TTL, I2L, HTL logic comes under the saturated logic family.
The Schottky TTL, and ECL logic comes under the unsaturated logic family.
7.State the classifications of FET devices.
FET is classified as
1. Junction Field Effect Transistor (JFET)
2. Metal oxide semiconductor family (MOS).
8.Mention the classification of saturated bipolar logic families.
The bipolar logic family is classified as follows:
RTL- Resistor Transistor Logic
DTL- Diode Transistor logic
I2L- Integrated Injection