Question
State the basic electronic circuit involved in the electronic circuit of figure and find the value of the output y. Name the gate formed and set up a truth table for it.
Solution
The logic gate shown is a bubbled AND gate.
It is a combination of two NOT gates and one AND gate, i.e., the output of two NOT gates is applied as the input of AND gate.
The Boolean expression for output of this gate is,
(From De-Morgan's Theorem).
This expression represents a NOR gate.
Hence, a bubbled AND gate is equivalent to a NOR gate.
Truth table of NOR gate is as shown in the table below:
It is a combination of two NOT gates and one AND gate, i.e., the output of two NOT gates is applied as the input of AND gate.
The Boolean expression for output of this gate is,
(From De-Morgan's Theorem).
This expression represents a NOR gate.
Hence, a bubbled AND gate is equivalent to a NOR gate.
Truth table of NOR gate is as shown in the table below:
