 Hi Learners! I hope you are having a productive Day. Welcome from the Team of The Engineering Projects. We are starting a new tutorial that is a full piece of information about a logic Circuit. The circuit that we are learning today is Full Adder. In our previous tutorial, we have seen 2-Bit Full Adder using Logic Gates in Proteus software today we are going to design & simulate 4-Bit Full Adder using Logic Gates in Proteus. We will discuss following topics in today's lecture:
2. How can we define Full Adder and its types?
3. What is the working mechanism of Four bits Full Adder ?
4. What is the Procedure to simulate four bit full Adder in Proteus ISIS?
5. What is the example of the Solving the addition process?

In Computer system, computation is an important procedure. The adders play a vital role in this  Process. First of all, Let's define the Adders:
"The Adders are the Logical Circuits that are specially designed to add the two or more numbers in a system."
In the world of electronics, adders are used to add the bits. The computer system depends upon the flow of bits and the computation of bits. Adders take the input in the form of bits and perform the addition according to the type of Adder used. Basically, we divide the adders into two types:
We have read about the Half Adder in detail in the past educative essay. Yet we have to recall the full adder's introduction.
"Full Adders are the Circuits that have a ability to to add two inputs bit along with a carry bit, hence it contain a carry input, two bits inputs and two outputs for the result and the resultant carry."
we further classify the Full Adder into two main types:

As the name implies, a four bit full adder can add four input bits. The definition of Four bits Full adder is given next:
"A four bit full Adders is a Logical Circuit that takes Carry and two expressions with four bits as its inputs and as a result shows the Four bits output along with the carry at output terminals."

### XOR Gate

A XOR Gate, is a two input Logical Circuit that give the output HIGH only when the inputs have the values alternating of each other. Or else, it is LOW.

### AND Gate

AND Gate is the a logical Circuit that gives the Output HIGH only when its both inputs are HIGH, otherwise the output is LOW.

### OR Gate

The OR Gate is a logical Circuit with the working such that when on of the Input is HIGH, the value of the Output is also HIGH.

### DID YOU KNOW????????????????

You can make the Full Adder by simply merging two Half Adders in a specialized manner.

## Working Mechanism of 4-bit Full Adders

The Four bit Full Adders works in interesting manner. The XOR Gates are responsible for the addition of input bits. In order to get the full addition circuit we attach two AND gates with the circuit in such a way that the  result of addition connects the OR Gate and we get the carry. In the designing of circuit, we simply make a small circuit of AND Gate and XOR Gate. Then we design a Circuit of two bits Full Adder. The cynosure of the circuit is, we'll copy the block and arrange four blocks in a way that the output carry of the block becomes the input carry of the next. This cycle will continue and at the  fourth block we get the resultant carry of whole calculation. we can input only one carry of our will at the Block A.

## Practical performance of 4-Bit Full Adder

If you wish to stimulate the Four bits full adder in Proteus then follow the simple steps given below. We'll make our circuit according to the Functional Diagram given before.
• Get the required material.

### Required Devices

1. XOR Gate
2. AND Gate
3. OR Gate
4. Logic Toggle
5. LED
6. Ground Terminal
• Push the "P" button presented at left area of the screen.
• Select first four elements from the Library by mere writing there names one after the other.
• Get  a XOR Gate and one AND Gate.
• Connect the Logic Toggles with each input of XOR Gate.
• Connect an LED with the end of the XOR Gate.
• Go to Terminal Mode and get the ground terminal to attach the Ground Terminal with LED.
• Drag and drop two XOR Gates, two AND Gates and one OR Gate and arrange them at the working area one after the other according to the image given below: • Attach Logic Toggle with each input of switch 1.
• Get the LED and join it with the output of switch 3.
• Click the left button of mouse> go to Terminals> Ground Terminal.
• Place the ground Terminal just below the LED.

• Select the whole block left click>drag and drop the required area. It will create a doted square around the circuit.
• Right Click> copy block.
• Right click the mouse and paste the block with the same procedure.
• Repeat the Pasting Process one time more and paste the circuit copy just one below the other.
• Connect the each output carry switch with the input of the next.
• Grab the Logic Toggle from the Pick Library and join it with the input carry wire of the first block.