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What distinguishes the look-ahead-carry adder?(a) It is slower than the ripple-carry adder(b) It is easier to implement logically than a full adder(c) It is faster than a ripple-carry adder(d) It requires advance knowledge of the final answerThe question was asked during an online exam.This interesting question is from 4-Bit Parallel Adder/Subtractor in chapter Arithmetic Circuits of Digital Circuits |
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Answer» CORRECT answer is (c) It is faster than a ripple-carry adder The best I can EXPLAIN: It is faster than ripple carry adder as it reduces the PROPAGATION delay by converting the ripple carry in such a way that the carry over a GROUP of bits of the adder BECOMES 2-level logic. |
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