Question

Write the drawbacks of ripple carry adder

Answer 1

Figure 5: 4-Bit carry lookahead adder implementation detail. The disadvantage of CLA is that the carry logic block gets very complicated for more than -bits. For that reason, CLAs are usually implemented as 4-bit modules and are used in a hierarchical structure to realize adders that have multiples of -bits.

Answer 2

The drawbacks of the ripple carry adder:

• We can get the output very late since the whole process takes a lot of time to calculate the end result.
• There are some design issues with the whole system of the ripple carry adder.
• The whole process and the whole calculation for calculating the end output is quite complex.
• We need to understand each and every term and have to be extra careful to calculate the end output.

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