Twisted Ring Counter

[111]

I am in the work of counters using flipflops (7476). I am now building a twisted ring or Johnson Counter. The problem is with their duty ratio, how can I change the duty ratio of a twisted ring counter? Is it fixed for 0.5, or it can be varied by adding any gates in their feedback path?

 

[Roff]

You can decode any duty cycle you want, within the resolution of your counter, with a single two input gate. I haven't thought about adding gates in the feedback path, but I would think it would also modify your divide ratio. It also ceases to be a folded ring (Johnson) counter.