In which of the following adder circuits, the carry look ripple delay is eliminated? A. Half adder B. Full adder C. Parallel adder D. Carry-look-ahead adder E. None of the above

The correct answer is D. Carry-look-ahead adder.

A half adder is a simple digital circuit that adds two single-bit numbers together. It produces two outputs: a sum bit and a carry bit. A full adder is a digital circuit that adds two single-bit numbers together and produces a carry bit for the next stage in a larger addition. A parallel adder is a digital circuit that adds two multi-bit numbers together in parallel. A carry-look-ahead adder is a digital circuit that eliminates the carry look ripple delay in a parallel adder.

The carry look ripple delay is the time it takes for the carry bit to propagate through all the stages of a parallel adder. This delay can be significant for large adders. The carry-look-ahead adder eliminates this delay by calculating the carry bits for each stage in advance. This allows the carry bits to be propagated through the adder much faster.

Here is a diagram of a 4-bit parallel adder:

The carry look ripple delay in this adder is the time it takes for the carry bit to propagate from the first stage to the

Here is a diagram of a 4-bit carry-look-ahead adder:

The carry look ripple delay in this adder is zero. This is because the carry bits are

The carry-look-ahead adder is a more complex circuit than the parallel adder, but it is faster. The carry-look-ahead adder is used in high-speed digital circuits, such as microprocessors.