An four-bit carry-look-ahead adder for computing the sum of 2 numbers , where A and B are integers represented in 2's complement form. If the decimal value of A is 3, the decimal value of B that leads to the longest value for the sum to stabilize is __________________

I know adder is used for adding two numbers and carry look ahead adder is used for propagating the carry. But how it could be used for stabilising a sum, I couldn't understand this part and couldn't able to answer

  • $\begingroup$ "Stabilisation" is probably meaning waiting due to the propagation time across gates. Compared to cascading full adders, a carry look-ahead circuit allows to reduce the overall time of the multi-bit adder. $\endgroup$ – TEMLIB May 21 '18 at 21:21
  • $\begingroup$ ok, can u discuss it more? $\endgroup$ – Mark May 22 '18 at 2:02

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