Hi I'm not 100% sure I understand exactly what you are thinking about setting up. My guess is that the counter needs to run at the same THz speed as the oscillator. That's pretty fast. I suspect that what ever you use, speed / propagation delay in the counter it's self will be an issue. That will get you back to either a ripple counter or a Johnson counter.
Bob On Apr 15, 2010, at 7:07 AM, Eugen Leitl wrote: > On Thu, Apr 15, 2010 at 02:48:58AM -0700, Hal Murray wrote: > >> I'm not aware of anything like I think you are describing. >> >> What problem are you trying to solve? >> >> The main reason that I think of using gray codes is for crossing clock >> domains. >> >> But as Magnus pointed out, another possible problem is just counting at high >> speeds. > > I was idly musing about how to reliably count an integrated solid-state > THz oscillator adjacent to a (very wide) counter. The problem is due > of relativistic signal delays which are in the ballpark of counter > feature size. A way to circumvent that is to keep relevant state changes > to the oscillator lightcone. Hence Gray codes with local bit flips, > or something similar. > > The compensation for drift and e.g. relativistic (spacetime curvature > and motion) effects would happen by directly applying small numerical > deltas to the ALU downstream of the counter. The result would be a > clock directly compensated against movement and position in a gravitation > well. > > -- > Eugen* Leitl <a href="http://leitl.org";>leitl</a> http://leitl.org > ______________________________________________________________ > ICBM: 48.07100, 11.36820 http://www.ativel.com http://postbiota.org > 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
