# Realization of Logic Gate Using Universal gates

• Difficulty Level : Easy
• Last Updated : 25 Nov, 2021

In Boolean Algebra, the NAND and NOR gates are called universal gates because any digital circuit can be implemented by using any one of these two i.e. any logic gate can be created using NAND or NOR gates only.

Every logic gate has a representation symbol. The below image shows a graphical representation of all logic gates

Graphical representation of logic gates.

### 1. Implementation of AND Gate using Universal gates.

#### a) Using NAND Gates

The AND gate can be implemented by using two NAND gates in the below fashion:

#### b) Using NOR Gates

Implementation of AND gate using only NOR gates as shown below:

### 2. Implementation of OR Gate using Universal gates.

#### a) Using NAND Gates

The OR gate can be implemented using the NAND gate as below:

#### b) Using NOR Gates

Implementation of OR gate using two NOR gates as shown in the picture below:

### 7. Implementation of NAND Gate using NOR Gates

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