Digital Electronics/Logic Gates/Fundamental Digital Gates

Digital Gates

Digital gate is a Digital Device used to perform the logic operation on the input(s) to produce an equivalent logic in the output. The output produced from the inputs are listed in a table called a Truth table. The relation between output and inputs can also be represented by a mathematic equation .

There are 5 basic digital gates used to perform Logic Operation namely Buffer, NOT, AND, OR, XOR

Basic Digital Gates

Basic Logic Gates

Symbol

Mathmatical Formula

Truth Table

Buffer

Q = A

A	Q
0	0
1	1

NOT

Q = NOT A

A	Q
0	1
1	0

AND

Q = A . B

A	B	Q
0	0	0
0	1	0
1	0	0
1	1	1

OR

Q = A + B

A	B	Q
0	0	0
0	1	1
1	0	1
1	1	1

XOR

Q = A (+) B

A	B	Q
0	0	0
0	1	1
1	0	1
1	1	0