Question

Full subtractor

06 Mar 2026
Answer :
Word Count : 255
A full subtractor is a combinational logic circuit that performs subtraction of three bits: the minuend bit (A), the subtrahend bit (B), and the borrow-in bit (Bin) from the previous lower significant stage. The full subtractor produces two outputs: the difference (D) and the borrow-out (Bout). The difference output represents the result of the subtraction, while the borrow-out indicates whether a borrow is required for the next higher bit subtraction. The Boolean expression for the difference output is given by D = A ⊕ B ⊕ Bin, where ⊕ denotes the XOR
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