Explanation/Uses : Any digital computation process consists in performing a sequence of arithmetical operations on the data of the problem. At each stage in the computation, the nature of the operation to be performed is decided partly by the pre-determined program and partly by the outcome of earlier stages in the process. We therefore need switches with multiple inputs to perform logical operations, i.e., the outputs of these switches are determined in specified ways by the condition (binary state) of their inputs. These arrangements are known as logic gates, and mostly they are extension of a simple transistor switch.
The NOT gate or INVERTER : It is a circuit with one input whose output is HIGH if the input is LOW and vice versa.
The NOT operation outputs an inverted version of the input. Hence, a NOT gate is also known as an INVERTER.
The small invert bubble on the output side of the inverter logic symbol, below figure and the over bar \(\bar{A}\) in the Boolean expression represent the invert function.
Logic symbol :
Boolean expression :
Y = \(\bar{A}\)
Truth table :
The NOT gate
