GATE | GATE 2017 MOCK II | Question 47

The following is the AB flip flop:

digital1

What are values of A, B when change in the flip flop state is from 0 to 1 ?

Note: x in the options below represents that it can have any value out of 0 and 1.
(A) 1, x
(B) 0, x
(C) 1, 0
(D) x, 1


Answer: (B)

Explanation: Characteristic equation => Qn = A′.Q′ + B′.Q

To change from 0->1 means Q = 0 and Qn = 1



Thus

1 = A’(1) + B’(0) = A’

Hence , A = 0 and B can have 0 or 1 not matters.


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