The output of each stage of flip-flop is connected to input of next stage flip-flop and the complement output of the last stage flip-flop is again connected to the input of first stage flip-flop then this is called
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A twisted ring counter produces a non-binary counting sequence and is often used for applications that require a cyclic sequence of states.
A twisted ring counter, also known as a Johnson counter, connects the complement output of the last flip-flop to the input of the first flip-flop, and the output of each stage is connected to the input of the next. This configuration results in a unique counting sequence.