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GATE | GATE-CS-2006 | Question 8

You are given a free running clock with a duty cycle of 50% and a digital waveform f which changes only at the negative edge of the clock. Which one of the following circuits (using clocked D flip-flops) will delay the phase of f by 180°? 

[caption width="800"] [/caption][caption width="800"] [/caption]

(A)

A

(B)

B

(C)

C

(D)

D

Answer

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