[time-nuts] DAC for OCXO disciplining

[Hal Murray]

lifespeed at claybuccellato.com said:
> Some thoughts that have occurred to me are coarse and fine DACs, possibly
> sigma-delta or pulse width modulation (PWM).

Pulse width modulation has noise at the frequency of the whole sequence.  A 10 
bit DAC running at 1 megahertz will have noise at 1 kilohertz.  As you add 
more bits to get better resolution, the noise frequency gets lower.  For 
practical values, that noise may be hard to filter.  What doesn't get filtered 
turns into spurs.

-- 
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