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4.0 NEGATED GATES

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There are 2 Negated Gates, these are the NOR and NAND gates. 

Basically these gates act like an OR and AND gate only there 

output is the opposite.





4.1 THE NAND GATE

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The truth table of a NAND gate is as follows



 A B | Q

 -------+------

 0 0 | 1

 0 1 | 1

 1 0 | 1

 1 1 | 0



Notice that it is the opposite of an AND gate.



 0 & 0 = 0, ~0 = 1



To wrap this up a bit better we use brackets ()



 ~(0 & 0) = 1

 ~(0 & 1) = 1

 ~(1 & 0) = 1

 ~(1 & 1) = 0



Now the result of the calcuation in the brackets is negated.




4.2 THE NOR GATE

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The truth table for the NOR gate is as follows



 A B | Q

 -------+------

 0 0 | 1

 0 1 | 0

 1 0 | 0

 1 1 | 0



 ~(0 | 0) = 1

 ~(0 | 1) = 0

 ~(1 | 0) = 0

 ~(1 | 1) = 0