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Q.
Which of the following logic gates is a universal gate?
AIIMSAIIMS 2005Semiconductor Electronics: Materials Devices and Simple Circuits
Solution:
The $NAND$ gate and the $NOR$ gate can be said to be universal gates since combinations of them can be used to accomplish any of the basic operations and can thus, produce and inverter, an $OR$ gate or an $AND$ gate. The non-inverting gates do not have this versatility since they can't produce an invert.
The basic symbol and truth table of $NAND$ gate are shown.
