LOGIC GATES

Logical gates:

It is a physical device to perform logical operations,from giving one or more INPUTS and takes One single OUTPUT.
Logic gates is mainly based on binary numbers,that means 0's & 1's. The first important thing is learn more about binary numbers and then learn this logic gates is best choice.Binary numbers is nothing but 0&1 it is a computer understandable language by converting our input code into binary.
 '1' is Positive,HIGH,ON etc.....
 '0' is Negative,LOW,OFF etc.....
Theabove two lines are for circuit design&diagram understanding logically.
Logic gates are three(3) types those are,

1.BASIC GATES
2.UNIVERSAL GATES
3.ARTHEMATIC/SPECIAL/OTHER Gates.

Let us know about each..........

1.BASIC GATES :

Basic gates has also three types those are ''OR ,AND,NOT''Gates.
Let us know about each gate....
a.OR GATE :
Logical operarion of or gate is ex: Y=A+B .
Y is output is.
A is the one of the input.
B is also one of the input.
Note:- we give two or more inputs but output is only one.
Truth table : truth table is a table for showing to get output from all possible inputs.
Observe that 1+1 is 2 but we understand 1 because in binary only 0&1 is considerable.This is same for all truth table please consider.
This is done by A+B=Y
Example:0+0=0,0+1=1........

b.AND GATE :
Logical operator of AND gate is Y=A×B (or) Y=A.B
Same Y is output,A is input,B is input.
Note: we give so many input but the output is only one.
Truth table.
See that logic is A.B=Y,so 0.0=0,0.1=0

C.NOT GATE :
Logical operation is A=`Y,that means A is opposte to Y.
Note : one INPUT is given also only one OUTPUT gives.
See that the first 0 is opposes to 1,1opposes to 0.logical operation is A=`Y.
This is all about BASIC gates..

2.UNIVERSAL GATES :

There are also two types in universal gates.Those are NAND GATES & NOR GATES.
a.NAND GATES :
Nand gates is nothing but combining of NOT&AND gates.Symblo is also combined of NOT&OR gates.Logical operation of NAND gates is Y=À.`B .That is nothing but OUTPUT Y is comes from multiply of A&B and makes bar nothing but opposite output.
See that when w multiply that 0.0 comes 0 but we reverse it then 0 reverse is 1.Same like that 0.1 is 0 but reverse is 1.
b.NOR GATE :
NOR gate is nothing but combining of NOT+OR is called NOR gate.The Logical operation of NOR gate is Y=À+`B,that means Output Y comes from adding A+B and reverse is the output.
See that first 0+0. is 0 but reverse of it is 1,0+1 is 1 but reverse is 0.this is based on Y=À+`B.
The ARTHEMATIC gates is discuss later in next post.ARTHEMATIC gates has two types X-OR GATE & X-NOR GATE.
let us make a breif innext post.
Thank you......

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