[time-nuts] GPSDO control loops and correcting quantization error

Don Latham djl at montana.com
Fri Sep 14 21:01:03 UTC 2012


Michael: Actually implementing a 16 bit DAC to its 1-bit minimum
resolution will be headache enough. You will gain a real education in
good grounding practice, shielding, power supply stability and noise,
and other Murphy intrusion. A 32 bit DAC IMHO, is impossible, and that's
the name of that tune.
Don

Chris Albertson
> On Fri, Sep 14, 2012 at 11:21 AM, Michael Tharp
> <gxti at partiallystapled.com> wrote:
>
>> Finally, do people think a 16 bit DAC is adequate or should I consider
>> building a 32-bit one? I looked at a few designs when putting this
>> together
>> but decided to keep it simple until things were up and running.
>
> Having a 32-bit DAC would give you enough range so that you could drop
> in any OCXO you might have.  But if you can have trimmer resisters to
> selected for your specif OCXO then 16-bits should be enough.   If it
> were me, I'd want the DAC steps to be smaller than what the phase
> detector can measure.     Said another way a 32-bit DAC might
> eliminate the need for scale and offset trimmer resistors.
>
> Chris Albertson
> Redondo Beach, California
>
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-- 
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
De Erroribus Medicorum, R. Bacon, 13th century.
"If you don't know what it is, don't poke it."
Ghost in the Shell


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com





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