Course Title : Digital Electronics -1 Course No.: 6841 Course Teacher:Engr: Suvadra Chowdhury Chief Instructor Chittagong Mohila –Polytechnic Institute.

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Presentation transcript:

Course Title : Digital Electronics -1 Course No.: 6841 Course Teacher:Engr: Suvadra Chowdhury Chief Instructor Chittagong Mohila –Polytechnic Institute

In electronics, a logic gate is a physical device implementing a Boolean function; it performs a logical operation on one or more logical inputs, and produces a single output.electronicsBoolean functionlogical operation

There are three types of basic gates: a. NOT Gate b. AND Gate c. OR Gate Another two types of logic gates: a. NAND Gate b. NOR Gate Those two logic gates known as universal gates.

a. EX-OR Gate b. EX-NOR Gate

The NOT gate is an electronic circuit that produces an inverted version of the input at its output. It is also known as an inverter. If the input variable is A, the inverted output is known as NOT A. This is also shown as A', or A with a bar over the top, as shown at the outputs.

The AND gate is an electronic circuit that gives a high output (1) only if all its inputs are high. A dot (.) is used to show the AND operation i.e. A.B.

The OR gate is an electronic circuit that gives a high output (1) if one or more of its inputs are high. A plus (+) is used to show the OR operation. The OR gate is an electronic circuit that gives a high output (1) if one or more of its inputs are high. A plus (+) is used to show the OR operation. The OR gate is an electronic circuit that gives a high output (1) if one or more of its inputs are high. A plus (+) is used to show the OR operation. The OR gate is an electronic circuit that gives a high output (1) if one or more of its inputs are high. A plus (+) is used to show the OR operation.

This is a NOT-AND gate which is equal to an AND gate followed by a NOT gate. The outputs of all NAND gates are high if any of the inputs are low. The symbol is an AND gate with a small circle on the output. The small circle represents inversion.

This is a NOT+OR gate which is equal to an OR gate followed by a NOT gate. The outputs of all NOR gates are low if any of the inputs are high.

The 'Exclusive-OR' gate is a circuit which will give a high output if either, but not both, of its two inputs are high.

The 'Exclusive-NOR' gate circuit does the opposite to the EOR gate. It will give a low output if either, but not both, of its two inputs are high.

 The NAND and NOR gates are called universal gates because all basic gates can be generated by using them.

Thanks to all