LOGIC GATE
In digital electronics logic gates are used to perform logical operations. It produces output depending on the logical value on its input. Mainly there are seven logic gates are used.
- AND, OR, NOT, these three are called basic gets
- NAND and NOR are called universal gates. Because we can make the function of each and every gate using those two types of gates.
- XOR and XNOR are lies under Exclusive or type.
- OR gate is an electronic circuit that produce a HIGH output (1) if one or more of its inputs are high. A plus (+) sign is used to show the OR operation
- AND gate is an electronic device that produce a high output (1) only if all its inputs are high. A dot (.) is used to show the AND operation (A.B)
- NOT gate is an electronic circuit that gives an inverted value of the input at its output. It is also known as an inverter. If we give a HIGH (1) value to its input, out put will be LOW (0). and If we give a LOW (0) value to its input, out put will be HIGH (1)
- NAND gate is equal to an AND gate followed by a NOT gate. The outputs of all NAND gates are HIGH (1) if any of the inputs are LOW (0). The symbol of NAND gate is an AND gate with a small circle on the output. The small circle represents inversion.
- NOR gate is equal to an OR gate followed by a NOT gate. The outputs of all NOR gates are LOW (0) if any of the inputs are HIGH (1). The symbol of NOR gate is an OR gate with a small circle on the output. The small circle represents inversion.
- Exclusive-OR‘ or XOR gate is a circuit which produce a HIGH (1) output if either, but not both, of its two inputs are HIGH (1). In the Symbol of an XOR an encircled plus sign (
) is used to show the XOR operation. - Exclusive-NOR’ gate circuit does the opposite to the XOR . It produce a LOW (0) output if either, but not both, of its two inputs are HIGH (1). Symbol of an XNOR gate with a small circle on the output. The small circle represents inversion.