FREE ASSISTANCE FOR THE INQUISITIVE PEOPLE
The digital world based on the three basic gates.
NOT Gate is also known as inverter. This gate receives only one input and gives us just inverted signal of the input. That is if the input is 1 then output is 0 and vise-versa. It is symbolized as
But in the combinational circuit we can use it as a bubble. If A is the input then output symbolized as A‘ or A in digital equations.
| NOT Gate | |
| INPUT | OUTPUT |
| 1 | 0 |
| 0 | 1 |
This gate receives two or more than two inputs but gives us only one output. This circuit gives a high (1) or true output if all the applied inputs are high. An AND gate symbolized as dot (.) in digital equations. If A and B are the input then output are A.B but sometimes the dot is omitted i.e. AB.
| AND Gate | ||
| INPUT | OUTPUT | |
| A | B | C |
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
This gate receives two or more than two inputs but gives us only one output. This circuit gives a high (1) or true output if any of the applied inputs are high. An OR gate symbolized as plus (+) in a digital equations. If A and B are the input then output are A+B.
| AND Gate | ||
| INPUT | OUTPUT | |
| A | B | C |
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
