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Digital circuits are electric circuits based on two discrete voltage levels labeled ‘Low’ ( 0 ) and ‘High’ ( 1 ) . Often ‘Low’ will be near zero volts and ‘High’ will be at a higher level depending on the supply voltage in use.
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Computers, electronic clocks, and programmable logic controllers are constructed of digital circuits.
There are six basic logic gates: AND, OR, NOT, NAND , NOR, and XOR.
Take XOR as an example, the basic operations of XOR ( Exclusive-OR ) gate are described below with the aid of its truth table .
A logic gate is an elementary building block of a digital circuit. Using combinations of logic gates, complex operations can be performed.
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