1.

The carry propagation delay in 4-bit full-adder circuits ___________(a) Is cumulative for each stage and limits the speed at which arithmetic operations are performed(b) Is normally not a consideration because the delays are usually in the nanosecond range(c) Decreases in direct ratio to the total number of full-adder stages(d) Increases in direct ratio to the total number of full-adder stages but is not a factor in limiting the speed of arithmetic operationsI have been asked this question in exam.I want to ask this question from 4-Bit Parallel Adder/Subtractor topic in section Arithmetic Circuits of Digital Circuits

Answer»

Right answer is (a) Is cumulative for each stage and limits the speed at which arithmetic OPERATIONS are performed

The explanation is: A FULL adder is a digital circuit with 3 INPUTS and two outputs SUM and CARRY. The carry propagation DELAY in 4-bit full-adder circuits is cumulative for each stage and limits the speed at which arithmetic operations are performed.



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