RIPPLE CARRY AHEAD ADDER

When multiple full adders are used with the carry ins and carry outs chained
together then this is called a ripple carry adder. In Ripple Carry Ahead Adder,
we cannot perform addition of two bits for any particular block unless the output
from the previous block is generated. This delays the overall addition process and
performance of the system.

This particular drawback of Ripple Carry Ahead Adder is overcomed by using Look Ahead Carry Adder.

The correct value of the carry bit ripples from one bit to the next.