> Moin,
>
> I just tried to figure out how phase microsteppers are usually build,
> but, beside the time-nuts discussion from 10 years ago and US patents
> US4358741 and US4417352 my search turned out empty. I am pretty sure
> that I used the wrong search terms and there should be lots of documentation
> out there. Can someone give me a hint what to look for?
>
> Attila Kinali
Attila,
Try these search terms:
phase microstepper
microphase stepper
time frequency phase "offset generator"
auxiliary offset generator
phase frequency AOG
programmable clean-up oscillator
The two commercial products I'm familiar with get down to 1e-19 resolution:
http://www.microsemi.com/products/timing-synchronization-systems/time-frequency-references/active-hydrogen-maser/aog-110
http://www.spectradynamics.com/products/hrog-5-high-resolution-phase-and-frequency-offset-generator
Somewhere I have the block diagram for these. Very complex. Depending on the
resolution and stability specs you need a DDS solution might be simpler today.
The write-up about Bert's DDS board is here:
http://leapsecond.com/pages/ad9913/
http://www.analog.com/media/en/technical-documentation/data-sheets/AD9913.pdf
You'll want to use a DDS with a "programmable modulus" feature:
http://www.analog.com/media/en/technical-documentation/application-notes/AN-953.pdf
/tvb
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