Digital Logic gates (AND gate, OR gate, NOT gate)

Digital Logic Gates

Logic gates are the fundamental building blocks of digital systems.

There are three basic gates

1.  AND

2.  OR

3.  NOT

here in this picture you can find that for AND gates out-put becomes 0 if any of the input is Zero(0).

similarly for OR gate out-put is 1 if any of the input is 1.

NOT gate simply reverse the input at its out-put.

Here we are not going to the details of hardware realization of logic gates.(Since it is not in the syllabus of gate exam.)

Although we can realize any circuit using AOI(AND, OR, NOT) gates, there are also two different gates which can also realize any circuit using these gates. So we call these gates as universal gates. Name of these gates are NAND and NOR. from this figure we can also find their truth tables.
Here I am giving you an overview how these gate works we will come later here for more sophisticated   operation of logic gates.

here it is a java applet use this to understand the how logic gate works.

Posted in: Digital Electronics