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Design 4-bit Johnson Counter using J=K flip-flop. Explain its operation using waveform.
written 8.9 years ago by gravatar for teamques10 teamques10 ★ 70k •   modified 3.8 years ago

Mumbai University > Electronics Engineering > Sem 3 > Digital circuits and design

Marks: 10M

Year: May 2016
digital circuits and design
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written 8.9 years ago by gravatar for teamques10 teamques10 ★ 70k •   modified 8.9 years ago

Since 4-bit counter is required we will use 4 J-K flip-flops.

Operation.

  • Initially, a short negative going pulse is applied to the clear input of all flip-flops. This will reset all the flip-flops. Hence, initially the o/ps are $Q_3 Q_2Q_1Q_0$ =0000.

  • But $Q_3$'=1 and since it is copied to $J_0$ …

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