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Logic gates are components of digital circuits that define a logical sequence of actions. There are seven configurations of logic gates, each handling different logic response combinations. Examples include the AND gate, OR gate, exclusive OR gate, NOT gate, NAND gate, logical NOR gate, and XNOR gate. These gates perform various operations and can be combined in different ways. As technology advances, the concept of logic gates will continue to expand.
Logic gates are key components that are part of a digital circuit. In essence, a logic gate helps define a logical sequence of actions that occur under certain circumstances. The typical logic gate will provide one output and two inputs as part of the logic sequence. Also, digital circuits will operate at different voltage levels, using at least one of two binary conditions in any given execution of the sequence.
As of 2008, there are a total of seven different configurations for the logic gate. Each is designed to handle various logic response combinations and sequences that help the digital circuit work with optimal efficiency. Because the logic command will vary depending on the circumstances, a digital circuit often employs several if not all of these seven configurations.
The AND gate is used when ascertaining that the two inputs and outputs are similar. For example, if both inputs are judged to be positive and the output is also determined to be positive, the AND protocol will be present. Conversely, the OR logic gate indicates that there is a difference between the inputs and the output that is at least different and most likely diametrically opposite.
The exclusive OR gate is a logical gate that works essentially the same way an aut-or comparison works in linguistics. With this type of logic scheme, the output can be positive while one of the inputs, but not both, is also positive. Unlike the AND gate, all three elements need not be identical in an exclusive OR gate, but at least one input must agree with the output.
The NOT gate essentially reverses the logic sequence, and is characterized by the use of a single input instead of two. A NAND gate combines elements of both the AND gate and the NOT gate into a feature that requires a two-level response that mimics AND and then follows the logical NOT sequence.
The logical NOR gate combines the processes associated with an OR gate and a NOT gate. Still working within a forbidden sequence, the output must be different from the two inputs. The two inputs must necessarily be the same.
The seventh type of logic gate is the XNOR gate. This approach combines the exclusive OR gate with the NOR gate to obtain a logic sequence that judges the output to be positive if the inputs are both the same, but negative if the inputs differ.
All of these examples of logic gate function come into play in performing various types of operations. While these seven examples are the generally defined patterns for a given logic gate, it is generally recognized that other logic sequences composed of other combinations of various aspects of the gates can and do occur. As technology continues to advance, the form and function of the logic gate concept will continue to expand, enabling a wider range of tasks to be performed.
