Logic gates.docx

**Logic gates** Digital systems are said to be constructed by using logic gates. These gates are the AND, OR, NOT, NAND, NOR, EXOR and EXNOR gates. The basic operations are described below with the aid of [[truth tables]](http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/index.html#truth). **A...

**Logic gates** Digital systems are said to be constructed by using logic gates. These gates are the AND, OR, NOT, NAND, NOR, EXOR and EXNOR gates. The basic operations are described below with the aid of [[truth tables]](http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/index.html#truth). **AND gate** http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/graphics/AND.gif  **OR gate** http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/graphics/OR.gif  **NOT gate** http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/graphics/NOT1.gif  **NAND gate** http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/graphics/ENOR.gif  The \'**Exclusive-NOR\'** gate circuit does the opposite to the EOR gate. It will give a low output if **either, but not both**, of its two inputs are high. The symbol is an EXOR gate with a small circle on the output. The small circle represents inversion. The NAND and NOR gates are called *universal functions* since with either one, we can simulate the function of any other basic logic gate.