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Shift counters

Here data is shifted from one Flipflop to next flipflop so this is called Shift Counter.In this counter D flip flop is used.

 

MOD 2 ring counter

 

so using this ring counter we can get only mod N counter.i.e

If i have N flip flop in the ring counter then i always get mod N

 

MOD 4 Johnson counter

since D0=Q1' 

            D1=Q0


 all the state are involved in counting therefore we got a cycle or loop which is having all the state.So it is act as a mod4 counter.

If i have N Flipflop in twisterring (johnson )counter then i am able to form mod (2N)counter.

 

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