LOOK AHEAD 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.
If we know the output of previous block in advance using any logical or hardware arrangement
then we can perform addition quickly by using look Ahead Carry Adder. In look Ahead Carry Adder,
the computation for all the blocks is done simultaneously and when the output is generated from
the previous block, it is feeded to the next consecutive block and the process executes.