In this topic, we will learn about Basic Logic Gates and their types with Circuit Diagram and Truth Table ….What is logic gate ? Explain fundamental logic gates with circuit diagram and truth table.
What is Logic Gate ?
A Gate is a Basic Electronic circuit which operates on one or more input signals and produces only one output signal.
There are three Basic Logic Gates.
- AND Gate
- OR Gate
- NOT Gate(Inverter)
With the help of Basic Logic Gates other gates can be derived like NAND,NOR,XOR, XNOR etc.
What is universal Logic Gate?
Note:- Both NAND and NOR gates are also known as Universal gates. Because other Gates like AND,OR, NOT can be Prepared from these.
AND Gate
AND Gate:- This Gate can have two or more input signals but always produces only one output signal.
The output will be high (1) only when all the inputs are high.
| A | B | Y(A.B) |
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
| A | B | C | Y(A.B.C) |
| 0 | 0 | 0 | 0 |
| 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 0 |
| 0 | 1 | 1 | 0 |
| 1 | 0 | 0 | 0 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 0 | 0 |
| 1 | 1 | 1 | 1 |
OR Gate
OR Gate:- This Gate can have two or more input signals but always produces only one output signal.
The output will be high (1) when at least one input is high.
| A | B | Y(A+B) |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
| A | B | C | Y(A+B+C) |
| 0 | 0 | 0 | 0 |
| 0 | 0 | 1 | 1 |
| 0 | 1 | 0 | 1 |
| 0 | 1 | 1 | 1 |
| 1 | 0 | 0 | 1 |
| 1 | 0 | 1 | 1 |
| 1 | 1 | 0 | 1 |
| 1 | 1 | 1 | 1 |
NOT Gate
NOT Gate:- This Gate is an inverter that accepts only one input and produces one output. The output is always complement of the Input. If input is Low(0) then produces high(1) output and vice versa.
| A | A’ |
| 0 | 1 |
| 1 | 0 |
NAND Gate
The NAND Gate is the combination of AND Gate and NOT Gate where NOT gate follows AND Gate.It has two or more input signals but produces only one output signal.
This Gate produces a low output when all the inputs are high and a high output when any input is low.
NOR Gate
This Gate is the combination of OR Gate and NOT Gate where NOT gate follows an OR Gate. It has two or more input signals and produces only one output signal.
It produces a high output when all the inputs are low.
XOR Gate
This gate has two or more input signals but produces only one output signals. It produces a high output only when an odd number of inputs is high.
This gate is also known as exclusive OR gate.
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