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Ripple-Carry Adder for 2s complement

  1. May 3, 2013 #1

    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?

  2. jcsd
  3. May 3, 2013 #2
    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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