Q40. Give the AOI and OAI realizations for the sum and carry functions of a full adder.
Answer:
AOI form of realization is shown in the figure.
Q41. How do you realize pseudo nMOS logic circuits. Compare its advantage and disadvantages with respect to standard static CMOS circuits.
Answer:
In the pseudo-nMOS realization, the pMOS network of the static CMOS realization is replaced by a single pMOS transistor with its gate connected to GND. An n-input pseudo nMOS requires n+1 transistors compared to n transistors of the corresponding static CMOS gates.
This leads to substantial reduction in area and delay in pseudo nMOS realization. As the pMOS transistor is always ON, it leads to static power dissipation when the output is LOW.
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