Question

logic gates

Logic gates

what is the logic behind logic gates

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, optics, or even mechanical elements.

A logic gate is a combination of different electronic components, that takes one or more logic-level inputs and produces a single logic-level output. Because the output is also a logic-level value, an output of one logic gate can connect to the input of one or more other logic gates.

In electronic logic, a logic level is represented by a certain voltage (which depends on the type of electronic logic in use). Each logic gate requires power so that it can source and sink currents to achieve the correct output voltage. In logic circuit diagrams the power is not shown, but in a full electronic schematic, power connections are required. There are 7 positive logic gates and each gate has two laws or rules.

MORE HERE ---- http://en.wikipedia.org/wiki/Logic_gate