what is logic gates?
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In electronics, a logic gate is an idealized or physical device implementing a Boolean function; that is, it performs a logical operation on one or more binary inputs and produces a single binary output
Anshi2005:
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A gate is a digital circuit that follows certain logical relationship between the input and output voltages.
A logic gate has one output but one or more inputs. There are three basic gates such as OR gate, AND gate and NOT gate.
Each basic logic gate is indicated by a logic symbol and its function is defined and described either by a truth table or by a Boolean expression.
Truth table is a table that shows all possible input combinations and the corresponding output combinations for a logic gate.
Boolean expression is the expression which shows the combination of two Boolean variables that results into a new Boolean variable.
BASIC LOGIC GATES:
1. NOT Gate: It has one input and one output. It gives an inverted version of its input, i.e. if input is 1, then output is 0 and vice-versa. Its Boolean expression is given as Y = A'
2. OR Gate: It has two or more inputs and one output. In this gate, if any one of the inputs or all the inputs are 1 then output is 1. Its Boolean expression is given as Y = A + B
3. AND Gate: It has two or more inputs and one output. In this gate output is 1 only when all the inputs are 1. Its Boolean expression is given as Y = A.B
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