NOT Gate

NOT  gate performs the  inversion operation. This is  also know  as complemented. It  change high logic  level into  low logic level or vice versa. This is a single  input gate . the  output Y can be  expressed in  terms of inputs  as

 Y = A -

Where A   represents  NOT operation. If  input  a NOT  gate is  A then out put will be A ( it is  pronounced as A bar)  the logical  symbol  and truhtabel of not  gate  are shown  in fig.

                                         Figure (a)  symbol  and (b) truth table of not gate