O Level Notes : Physics - Logic Gates
Let us get started with the logic gates! We have many Logic Gates symbols i.e. the AND gate, the OR gate, NOT gate, the NAND gate and the NOR gate.
Hey everyone! Hope you are all good. Let us get started with the logic gates!
First of all, the symbols for logic gates.
- AND gate
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. Bear in mind that this dot is sometimes omitted i.e. AB
So, the truth table for this will be:
- OR gate
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.
So, its truth table will be:
- NOT 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.
So, the truth table for NOT gate will be:
- NAND gate
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.
So its truth table will be:
- NOR gate
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 symbol is an OR gate with a small circle on the output. The small circle represents inversion.
Its truth table will be:
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