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Basic Concept Of Logic Gates Including AND OR NOT and Universal Gate NAND , NOR #educatorbyte

              

               

Basic Concept Of Logic Gates Incuding  AND OR NOT and Universal Gate NAND , NOR


Logic gates are the basic elements in digital electronics. 

Basic gates can be constructed from the universal gates. There are two universal gates in the digital electronics. They are NAND gate and NOR gate.


  • Logical operation performed on one or more binary inputs that produces a single binary output.


  • In modern electronics  most gates are made from  metal oxide semiconductor field effect transistors


  • All digital systems can be constructed by only three basic logic gates. These basic gates are called the AND gate, the OR gate, and the NOT gate 



Basic logic Gates (AND, OR, and NOT gates) 

 
 ☆☆☆AND and NAND gates.

☆AND gate gives high output (1) if all the inputs are 1’s. otherwise the output will be low (0). 
 
Its Boolean algebra representation is:   C=A.B           
A B C 
0 0 0 
0 1 0 
1 0 0 
1 1 1 

☆The NAND gate works opposite to the AND gate. Its Boolean algebra representation is:   C=(A.B)’    And it’s truth table following: 
  
A B C 
0 0 1 
0 1 1 
1 0 1 
1 1 0 

                     
☆☆☆OR and NOR gates 
 
☆OR circuit will give high output (1) if any input is high (1). 
 
Its Boolean algebra representation is:     C=A+B           
A B C 
0 0 0 
0 1 1 
1 0 1 
1 1 1 

☆The NOR gate works opposite to the OR gate. Its Boolean algebra representation is:   C=(A+B)’           And it’s truth table as following: 
  
A B C 
0 0 1 
0 1 0 
1 0 0 
1 1 0 


☆☆☆NOT gate 
 
This is the simplest gate it just inverts the input, if the input is high the output will be low and conversely.           So   B=A’ 
  
A B 
0 1 
1 0 
 
                     
 
 

Source: Google 


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