IGNOU BPHET 143 2026 - Draw the circuit of 2's complement binary adder-subtractor and usi

Question

Draw the circuit of 2's complement binary adder-subtractor and using it explain the addition of binary equivalent of decimal number 9 and binary equivalent of decimal number 4 .

19 Jan 2026

Answer :

Word Count : 293

A 2's complement binary adder-subtractor circuit is designed to perform both addition and subtraction of binary numbers using a single adder circuit. The circuit consists of a binary adder, usually a full-adder chain, and an XOR gate connected to each bit of the second operand (B). A control input, often labeled as SUB or M, determines the operation: when M = 0, the circuit performs addition, and when M = 1, it performs subtraction. For subtraction, the XOR gates invert the bits of B to

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