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Q. To get an $OR$ gate from a $NAND$ gate, we need

VITEEEVITEEE 2013Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

To obtain OR gate from NAND gates we will use two NOT gates obtained from NAND gates and one NAND gate as shown in adjoining figure. Boolean expression is
image
$Y=\overline{\bar{A} \cdot \bar{B}}=\overline{\bar{A}}+\overline{\bar{B}}=A+B$
Which is of OR gate.