What is the difference between a "ripple carry adder" and a "carry-lookahead adder"?
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The correct answer is A) A ripple carry adder propagates the carry sequentially through each full adder stage, which can be slow for wide operands; a carry-lookahead adder computes carry signals in advance using additional logic, reducing the overall propagation delay
Correct Answer
A ripple carry adder propagates the carry sequentially through each full adder stage, which can be slow for wide operands; a carry-lookahead adder computes carry signals in advance using additional logic, reducing the overall propagation delay
In a ripple carry adder, each stage must wait for the carry from the previous stage, causing delay to grow linearly with the number of bits; carry-lookahead logic precomputes carries based on input patterns, significantly reducing this delay for wider adders.