Hi,
Vremya also have such boxes. The current one, VCH-317, goes under the
name "Real-Time Atomic Clock Combiner" which may not give you the
initial association of it being a micro-stepper. I have read the manual
for an older box, or at least an older description, which included a
nice description and overview, but I could not locate it.
"offset generator" is a re-occuring theme common to AOG and HROG.
The SpectraDynamics HROG is in patent US6278330.
As always, it can be interesting to look up cited patents and check what
else that company or inventor may have come up with.
Cheers,
Magnus
On 12/09/2015 10:51 PM, Tom Van Baak wrote:
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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