[time-nuts] lunatic fringe time standards

jimlux jimlux at earthlink.net
Fri Apr 16 00:22:54 EDT 2010


Bob Camp wrote:
> Hi
> 
> The only real limit on a Johnson counter is how clever you get making sure
> that only one stage is a 1 and all the rest are zeros. There are *lots* of
> ways to take care of that, each with it's own set of trade offs. 
> 

One problem with a Johnson counter is that it takes many more flipflops 
for a given number of states.  you get 2N states from N stages.

Compare to a standard binary counter where you get 2^N states from N 
stages, or a LFSR, where you get 2^N-1 states.




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