[time-nuts] Software Sawtooth correction prerequisites?

Jim Miller jim at jtmiller.com
Fri May 11 19:18:46 EDT 2007


My first post...newbie...be gentle...

I spent the last several evenings reading the archives and saw mention of 
sawtooth error correction in software. Since the corrections to be applied 
are on the order of 1e-9 seconds it would seem that the phase detector 
outputs to which these are applied must be similar in resolution.

That would seem to require a pretty hefty phase detector and a pretty 
substantial computing resource. Doesn't sound inexpensive. Is there a way 
around this?

OTOH, the Dallas Semi delay line pushes the "computation" out into the input 
of the phase detector at the cost of a $17 chip (1k qty) which in small 
quantities is likely $50 or so. This would seem to allow for a wider variety 
of phase measurement techniques.

Do I have this right?

tnx

jim miller
ab3cv 





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