Carry look ripple delay is eliminated in Carry-look-ahead adder

Dark Mode

2,929 views

3 votes

carry look ripple delay is eliminated in Carry-look-ahead adder as carry is already provided before the operation starts .

carry is calculated as follows:-

Substituting C1 into C2, then C2 into C3, then C3 into C4 yields the following expanded equations:

Here G (carry generator) is equal to

P(propagate) as follows

all the carry are calculated using the above formula and provided to input as mentioned in a diagram. Thus ripple delay is eliminated.

follow this link for further clarification:- https://www.geeksforgeeks.org/carry-look-ahead-adder/

0 votes

Option D; as in CLA the carry is generated in parallel. Hence no concept of ripple carry.

Please refer to the carry equation

Where $Gi$ is the generator Function and $Pi$ is the propagation function.

$Gi$ = $AiBi$ (Ai,Bi are Bit pairs of the two n bit numbers)

$Pi$ = $Ai+Bi$ or $Ai ⊕ Bi$

Follow CLA for further clarification.