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Q. Identify the gate represented by the block diagram as shown in figPhysics Question Image

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

The boolean expression of this gate is
$Y=\overline{(A+B) \cdot(A+B)}=\overline{(A+B)}+\overline{(A+B)}=\overline{(A+B)}$
which is for NOR gate.