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  1. What is the frequency of pulse at the points a, b, c in the circuit?

    2. A.
    3 MHz
    B.
    7.8 KHz
    C.
    10 KHz
    D.
    1 MHz

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    Answer : Option B

    Explanation :

    Ring counter is N : 1 divider.

    Hence ⇒ 1 MHz

    Johnson counter is 2N : 1 divider

    ⇒

    Ripple counter 2N : 1

    ⇒ = 7812.5 ∼ 7.8 kHz

    Mod 10 = 4 FF ⇒ 24 = 16.

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