BASIC LOGIC GATES

     AND gate – AND gate has two or more inputs and outputs. The AND gate produces a logic 1 at its output only when all of the inputs are high. A logic low state is produced when one or more of the inputs are low. The schematic diagram for AND gate is: 

 

     figure 1.

    

    OR gate – the or gate is a logic device that has two or more inputs and one output. The OR gate produces a logic 1 when one or more of its inputs are high. A logic 0 is produced only when all of the inputs are low.

   figure 2.

    NOT gate – the NOT gate or the inverter is a logic device that only has one input and one output. The inverter performs the logic function called the inversion or complementation, which means it changes the logic level applied to its input to the opposite logic level at its output. the schematic diagram of NOT gate:

               figure 3.