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If minuend = 0, subtrahend = 1 and borrow input = 1 in a full subtractor then the borrow output will be __________(a) 0(b) 1(c) Floating(d) High ImpedanceThe question was posed to me in class test.My question is from Fast Adder & Serial Adder topic in portion Arithmetic Circuits of Digital Circuits

Answer»

Right option is (b) 1

Easy explanation: If minuend = 0, subtrahend = 1 and BORROW INPUT = 1 in a full subtractor then the borrow output will be 1. Because on subtracting 0 and 1, one borrow is TAKEN and it proceeds till the next STEP (i.e 0 – 1 – 1 = 0, borrow = 1).



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