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Let A and B is the input of a subtractor then the output will be ___________(a) A XOR B(b) A AND B(c) A OR B(d) A EXNOR BThe question was asked in an interview for job.This intriguing question comes from Half & Full Subtractor topic in section Arithmetic Circuits of Digital Circuits

Answer»

Correct choice is (a) A XOR B

The EXPLANATION is: The subtractor has TWO OUTPUTS BORROW and DIFFERENCE. SINCE the difference output of a subtractor is given by AB’ + BA’ and this is the output of a XOR gate. So, the final difference output is AB’ + BA’.



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