How does logic gate works?

Answer 1

i guess others gave sufficient answers.. but they dealt with logic gates from the theoretical point of view. if u were wondering about how we can apply logic gates to electronic circuitry, i can help :)

Nowadays, most of logic gates are provided in IC's (Integrated circuites) basically built with transistors (mostly using CMOS technologies) .. still you can build a basic 2 input logic gate on your own, using one transistor or two diodes..

to have a basic idea about how can a transistor form a logic gate, take a look at this:
http://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/trangate.html

you should know something about microelectronics of course.

i'd like to mention that the NOR and the NAND gates are universal, meaning that any combination of logic gates can be totally expressed with one of these two gates, and i guess most IC's have those gates in their fabrication.

one last thing, when we deal with binary logic, we have only two discrete values (high and low/ 0 and 1) which means practically for example 1 volt and 5 volts (1 can take the notation 0 or 1, based on the design). practically, electric signals are not that discrete, we might have for example 2 volts, so the designer must take care of the signal limitations.

hope i could give satisfying answers!

Answer 2

Logic gate works on the principle of binary logic that has two states True & False or represented by 1 & 0.

Given the inputs A, B, the output is in C

The OR Gate

A B C
0 0 0
0 1 1
1 0 1
1 1 1

The AND Gate

A B C
0 0 0
0 1 0
1 0 0
1 1 1

The NOT Gate

A C
0 1
1 0

B C
0 1
1 0

The XOR Gate

A B C
0 0 0
0 1 1
1 0 1
1 1 0

By combining different basic gates together, complex logic can be constructed.

Answer 3

Logic gates are like switches, with two inputs (the NOT gate only has one input) that produce an output. The inputs are highs or lows (some level of voltage, ground) which based on what logic gate one uses, produces different outputs. There are 7 different types of gates, AND, OR, NOT, XOR, NAND, NOR and XNOR.
For example:
AND gate

Input Output
A B C
0 0 0
0 1 0
1 0 0
1 1 1

NOT gate

Input Output
A C
0 1
1 0

Answer 4

As you would already know, there are a few kinds of logic gates.
The basic idea is to have the input current, high (1) or low (0, being stepped down to a low current (0) or (1). The outcome depends on the input and also the kind of gate you are talking about.

Answer 5

The plastic you see is only the outer covering to protect the circuitry inside. Logic gates combine the inputs that you give it to produce one or more outputs. The design of the stuff inside determines how it combines inputs to produce outputs. For example an OR gate will produce a high output voltage (that may represent the logic state TRUE) if one or more of its inputs is high. Otherwise it would produce a low output which might be interpreted as FALSE. An AND gate will require all of its inputs to be high to produce a high output. Otherwise it would produce a low output which might be interpreted as FALSE. There are lots of different kinds of gates. The real intelligence comes from the person who decides what the overall device is supposed to do and how to produce that function using gates as building blocks.

Answer 6

'gates' by word tell us dat u let some one in (input) and u get someone out (output).
A logic gate performs a logical operation on one or more logic inputs and produces a single logic output. The logic normally performed is Boolean logic and is most commonly found in digital circuits. Logic gates are primarily implemented electronically using diodes or transistors, but can also be constructed using electromagnetic relays, fluidics, optical or even mechanical elements.

Answer 7

Logically,
1+1= 1
1+0=1
0+1=1
0+0=0
That is to say there can be only two 'states' called 'binary'.
High/ Low
or Yes/ No
or 1/0

Answer 8

Just understand the concepts of the various logic gates and any additional given information and you should be fine. Also thought we ought to, now and then, remember and thank self-taught Mathematician George Boole, whose style of Algebra made logic gates and programming possible.

Answer 9

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Answer 10

Logic functions are being considered and electronic circuits are designed to perform those logic functions .
Different kind of logic have been invented for example RTL, DTL , I2L ,Nmos , CMOS ,TTL ,STTL ,