Q. 45 A 4-bit carry look ahead adder, which adds two 4-bit numbers, is designed using
AND, OR, NOT, NAND, NOR gates only. Assuming that all the inputs are
available in both complemented and uncompensated forms and the delay of each
gate is one time unit, what is the overall propagation delay of the adder? Assume
that the carry network has been implemented using two-level AND-OR logic.
(A) 4 time units
(B) 6 time units
(C) 10 time units
(D) 12 time units
Answer: (B)
Explanation:
