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Authors:
Linda Null ,julia Lobur
Chapter:
Boolean Algebra And Digital Logic
Exercise:
Review Of Essential Terms And Concepts
Question:11 | ISBN:9780763704445 | Edition: 3

Question

11. Describe the operation of a ripple-carry adder. Why are ripple-carry adders not used in most computers today?

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Answer

Ripple Carry Adder is a combinational logic circuit. It is used for the purpose of adding two n-bit binary numbers. It requires n full adders in its circuit for adding two n-bit binary numbers. It is also known as n-bit parallel adder.

They are not used in computers because,

 It uses adders, it uses sequential generation of carries that "ripple" through the adder stages. It is slow, b/c the every carry needs to ripple through all the bit positions for the final bit pair to be evaluated.

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