Base of Digital electronics

1. AND Gate


2. OR Gate


3. NOT Gate


4. NAND Gate


5 NOR Gate


6. EX-OR Gate


7. EX-NOR Gate

EX-NOR Gate

The Exclusive NOR Gate function is a digital logic gate that is the reverse or complementary form of the EX-OR function. Basically the EX-NOR is a combination of EX-OR Gate and NOT Gate but has a truth table similar to the standard NOR Gate in that it has an output that is normally at logic level "1" and goes LOW to logic level "0"  when any of its inputs are at logic level "1".

Above is how EX-OR Gate  form using other Gates .

EX-OR Gate

There are two other types of digital logic gates which although they are not a basic gate in their own right as they are constructed by combining together other logic gates, their output boolean function is important enough to be considered as complete logic gates. These two logic gates called Exclusive-OR (EX-OR) Gate and its complement the Exclusive NOR Gate.

Above shows EX-OR Gate and its truth table.

By using basic gates and Universal gate we make EX OR Gate

OR Gate

In this gate any of the input is 1 so output is 1. This is basic function of this gate. Basically it will add all the input and gives output. figure below is 2 input OR gate.

Truth table of 2 input OR gate

Basically how it will work like a parallel circuit

NOT Gate

This gate is basically a inverse gate . It have only one input and one output. It just inverse the input
Given below symbol and truth table.

Transistor circuit of NOT gate.

IN this circuit NOT gate in IC . generally 6 gates are included in one IC, it is more than AND & OR gate because it has only one input and one output.





Other Gates
AND Gate

OR Gate

NAND Gate

NOR Gate

AND Gate

1. AND Gate

Symbol of AND gate

Above the basic operation for 2 input AND gate.(multiply system)

If both  A &  B are true than answer will be TRUE 

Above is the 2 and 3 input AND gate.

NOR Gate

The logic NOR gate is a combination of the digital logic OR gate with that of an inverter NOT gate connected togather in series.

" If both A & B are Not true , than Q is true."

NAND Gate

The NAND function is a combination of two separate gates  function AND & NOT .
NAND function is a series combination of series AND gate and NOT gate.
The logic function of NAND gate in Boolean algebra is   A.B.

Above figure is for symbol of NAND gate.

Above figure is how we get output of NAND gate .

Truth table for NAND Gate.

Other  Gates

AND Gate

OR Gate

NOT Gate

NOR Gate