Title: Operation on Logic Gates
Objective:
1. To investigate the operation of an “AND” gate.
2. To investigate the operation of an “OR” gate.
3. To investigate the operation of a logic
inverter (“NOT” gate).
Theory:
Logic gates are the basic building blocks of any digital
system. It is an electronic circuit having one or more than one input and only
one output. The relationship between the input and the output is based on a certain
logic. Based on this, logic gates are named as AND gate, OR gate, NOT gate
etc.
1. 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
Fig: Symbol for AND gate
Boolean Algebra: A.B
Fig: Truth table for AND gate
2.
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. The diagrams below show two
ways that the NAND logic gate can be configured to produce a NOT gate. It can
also be done using NOR logic gates in the same way.
Fig: symbol for NOT gate
Boolean Algebra: A'
Fig: Truth Table for NOT Gate
3.
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.
Fig: Symbol for OR gate
Boolean
Algebra: Y=A+B
Fig: Truth Table for OR Gate
Observations
Conclusion
Based off the “truth tables” it is seen that how unique each gate is. Furthermore, the different gates work in
their own ways. For instance, an AND
Gate requires both inputs to be 1 in order for the circuit to function, hence
“AND Gate”. An “OR Gate” works in the
opposite way of an AND Gate. In order
for an OR Gate to make the circuit work, it at least needs one of the inputs to
have a 1 value hence “OR Gate”. The “NOT Gate”
is also known as an Inverter. All
it does, is give an output that is opposite to its inputs making the gate the
simplest one to use out of the rest of the gates.
Refrences :
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