Ripple-Carry Adder for 2s complement

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A 4-bit Ripple-Carry adder has been designed for adding two unsigned integers A and B. The discussion revolves around whether modifications are necessary when A and B are represented in 2's complement. It is suggested that the circuit remains unchanged due to the inherent advantages of 2's complement representation. However, a clarification is made that adjustments are needed regarding carry handling, specifically that the carry should be discarded when the last two stages produce a carry. The conversation highlights the importance of understanding carry management in 2's complement addition.
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Hi,

I have designed a simple 4 bit adder for adding two 4-bit unsigned integers A and B.
The adder consists of a chain of 4 Full-Adders (Ripple-Carry adder).

I am wondering if I need to change the circuit when A and B are in 2s complement.

I don't think so. Isn't the advantage of 2s complement that the circuit does not change?

Thanks
 
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Sorry, I think I need to modify it regarding the carry: The carry must be discarded when the last 2 stages have a carry ...
 

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