The three-stage Johnson counter as shown in figure is clocked

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The three-stage Johnson counter as shown in figure is clocked at a constant frequency of ƒ_c from the starting state of Q₂Q₁Q₀ = 101. The frequency of output Q₂Q₁Q₀ will be

1. ƒ_c/8
2. ƒ_c/6
3. ƒ_c/3
4. ƒ_c/2

Correct Option: D

We see that 1 0 1 repeat after every two cycles, hence frequency will be ƒ_c/2 .