Hello, readers welcome to the new post. Here we will discuss Logic Gates. Logic gates are circuits or devices that are used as the main components of digital electronics. They used to do different operations that are main for digital circuits. Some electronic device operations is defined by the form of logic gates. Such as logic gates used for digital electronics like mobile phones and tablets.

In this post, we will discuss digital circuits and their truth tables in detail. So let’s get started

## Introduction  to Logic Gates

• There are 7 main types of logic gates such as AND, OR, XOR, NOT, NAND, NOR, and XNOR. AND gates is called since if zero is false or one is true gate operates like a logical “and” operator.

## What are Logic Gates?

• Logic gates are considered as building blocks of digital systems. It is like a circuit that has one or more than one input and one output. The relation between input and output is according to logic.
• Logic gates are the basic building blocks of any digital system. It is an electronic circuit having one or more than one input and only one output. The relationship between the input and the output is based on a certain logic. Based on this, logic gates are named AND gate, OR gate, NOT gate, etc.

### AND Gate

• AND perform the logical multiplication of input. It produces high or 1 output if both inputs are one or high. The output of AND gate will be low if anyone’s input is low.
• AND gate accepts two or more than 2 inputs at one time.
• If all inputs are 1 then the output will be 1

Input A Input B Output
0 0 0
0 1 0
1 0 0
1 1 1

### OR Gate

• The OR gate means either or in condition. the output is true or 1 if both inputs are true or one. If both inputs are zero then output will be false or zero.  For output to one anyone input is one

Input A Input B Output
0 0 0
0 1 1
1 0 1
1 1 1

### XOR Gate

• The XOR gates work in logical form either/or. The output is true if any but not both inputs are true. The output is false if both inputs are false, or if both inputs are true. The output is one if the input are different but zero if inputs are same

Input A Input B Output
0 0 1
0 1 0
1 0 0
1 1 0

### NOT Gate

• The not gate also inverter gate for different from other types of inverter devices. It has only one input. The not gate reverse logic gate, if input is one then output is zero and if input is zero then output is one.

Input Output
0 1
1 0

### NAND Gate

• The NAND gate works as an AND gate with a NOT gate combination. It works as that logical operation AND follows with not. The output is false if both inputs are true.Then the output is true. NAND gate inverts the output of the AND gate. The NAND gate symbol is AND gate having circle of NOT gat at output side

Input A Input B Output
0 0 1
0 1 1
1 0 1
1 1 0

### NOR Gate

• The NOR gate is a combination of the OR gate and with inverter. Its output is true if both inputs have zero value. Otherwise output is false.

A B Output
0 0 1
0 1 0
1 0 0
1 1 0

### XNOR Gate

• The XNOR gate is a mixture of the XOR gate with the inverter. Its output is true if inputs are the same value or false if inputs are not the same

Input A Input B Output
0 0 1
0 1 0
1 0 0
1 1 1

### Why are logic gates called?

• The logic gates are known as gates since they have one true output when any combination of one or zero is at inputs. These combination are important for the output

### What are the three types of logic gates?

• Basics gates are AND gates, OR gates, and NOT gates. Some gates are the NAND gate, the NOR gate, and the EOR gate as part of a family of basic logic gates.

### Who created logic gates?

Geroge Boole invented the logic gates. He was born in Lincoln and the son of a shoemaker in a low-class family.

### What are applications of logic gates?

• Logic gates are used in controllers, processors electronic and electrical circuits, and embedded systems. The basic logic gates are  AND, OR, XOR, NAND, NOR, XNOR, and NOT.

### What are the functions of logic gates?

• They are important devices that are based on Boolean functions. Logic gates are used to carry logical operations on single or different binary inputs and provdie one binary output. In simple words, logical gates are electronic circuits in a digital system.

### What are Universal gates?

• For certain logical processes, universal gates are made through a combination of two or more fundamental gates. Universal gatesare  NAND and NOR gates.

### What is the output of a NOT gate when input 0 is applied?

• Since not gate is an inverter in result if zero is used as input and output is one.

### Which logic gate is known as the “invertor”?

• The inverter is called the NOT gate that gets output is the inverse of the input

### What is the Boolean expression for OR gate?

• IF X and Y are input and OR gate output will be Z=X+Y.

### What is the Boolean expression for the XNOR gate?

• If A and B are input and XNOR gates output will be as Y=A.B+A’B’.