[time-nuts] Thermal Compensation: Digital vs Analog

Magnus Danielson magnus at rubidium.dyndns.org
Sat Mar 1 08:38:06 EST 2014


On 26/02/14 17:09, Bob Stewart wrote:
> I've been experimenting with digital thermal compensation on my GPSDO.  The results have been favorable for a 14 bit dithered PWM-based DAC, but leaves a bit to be desired in the big picture.  And it takes up a lot of program bytes on my PIC..  What's the general consensus on this?  Should thermal compensation be completely analog?

Considering that time-constants can be fairly long, there is a benefit 
in having at least that part of the integrator in digital domain.

There are benefits of both approaches. Resolution of input and output 
can be a problem for the digital solution.

Cheers,
Magnus



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