[time-nuts] yet another GPSDO design, or so

Hal Murray hmurray at megapathdsl.net
Tue Jun 29 16:05:44 EDT 2010


> or with a pair of current output DACs and a resistive divider/summer so  you
> have a "high order" and "low order" voltage. 

If it were that simple, the manufacturers would package it up into a single 
chip. :)

I think there are two areas of interest.  One is the obvious one that steps 
on the high-order DAC won't cleanly map into a constant number of steps in 
the low-order DAC.

The other is things like temperature shifts.  You have to work out the specs 
for both paths and take the worst one.


-- 
These are my opinions, not necessarily my employer's.  I hate spam.







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