GATE Bits 55 56 Sequential Circuits || Lesson 133.2 || Digital Electronics || Learning Monkey ||

Here we will solve GATE Bits 55, 56 Sequential Circuits.
Consider a 4 bit Johnson counter with an initial value of 0000. The counting sequence of this counter is:
(A) 0, 1, 3, 7, 15, 14, 12, 8, 0
(B) 0, 1, 3, 5, 7, 9, 11, 13, 15, 0
(C) 0, 2, 4, 6, 8, 10, 12, 14, 0
(D) 0, 8, 12, 14, 15, 7, 3, 1, 0

GATE 2015

Answer: (D)

Consider the following circuit with initial state Q0 = Q1 = 0. The D Flip-flops are positive edged triggered and have set up times 20 nanosecond and hold times 0
Consider the following timing diagrams of X and C; the clock period of C = 40 nanoseconds. Which one is the correct plot of Y?
GATE 2001

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