[time-nuts] Thunderbolt? (re simple gpsdo.)

[Hal Murray]

> Yes, the DAC+reference is challenging and one way to go may be the
> coarse+fine approach to avoid large (18bit and beyond) DAC. My last GPSDO
> has an 18bit DAC but now I'm thinking to try the 8bit digital pot + 16bit
> DAC op-amp combined. The reference can't be overlooked anyway. 

Be careful, there is no free lunch.  If you use a pair of DACs, the stability 
of the coarse DAC needs to be evaluated relative to the bottom bits of the 
fine DAC.

-- 
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