[time-nuts] Frequency Stability of Trimble Mini-T
Mike Monett
XDE-L2G3 at myamail.com
Thu Oct 16 22:50:37 UTC 2008
"Lux, James P" <james.p.lux at jpl.nasa.gov> wrote:
[...]
> Even without TMR or other similar schemes, the probability of
> upset IS pretty low. However, as Black or Scholes said (I can't
> remember which), "One should not confuse very low probability with
> impossible". If it absolutely, positively can't take any hit, then
> some more work is involved.
> James Lux, P.E.
How do you do that? Any web links to study?
As far as I know, it is impossible to absolutely guarantee against
metastability. Do you wait a week for the metastability to settle?
If zero probability of failure is so important, you would also have
to include the probability of a solder joint opening, or a chip
failing due to metal migration or latent ESD damage. That is never
zero.
Of course, after the system is perfect, someone will take it and put
it on a destroyer running Windows:)
Best Regards,
Mike Monett
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