RFQ Wenzel-class frequency reference card - Githubissues

sinara-hw / Wenzel_ref

Wenzel-class clock source for Sinara

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RFQ Wenzel-class frequency reference card #1

Open gkasprow opened 10 months ago

gkasprow commented 10 months ago

We plan to develop an EEM/DIOT card with a Wenzel-class oscillator and configurable outputs Initial spec:

Footprint for Wenzel 100MHz but also OLA500x oscillators with even better spec (OLA5007) from Pletronics
SPI DAC for tuning (part of PLL system)
Clocker-like fanout but with the possibility of changing the division ratio on some outputs (to get i.e. 10MHz)
Some Outputs capable of driving Toptica lasers (+6dBm)
EEM & DIOT form factor

gkasprow commented 9 months ago

airwoodix commented 9 months ago

Looks cool, thanks for sharing! What's the development status?

I see that the DAC is nice to lock the oscillator, but it may require quite a bit of external hardware. Would it be an option to integrate hardware to lock on a PPS signal (e.g. from a GNSS receiver or an atomic reference)? Or would this blow up this project's scope or real estate? Alternatively, maybe an EEM board controlled from a Humpback would be nice (or another board on the DI/OT backplane)?

gkasprow commented 9 months ago

We just ordered PCB and parts. Must wait for next release.

gkasprow commented 9 months ago

If you have some verified solution that performs such locking that would help. I'd rather lock it to 10MHz instead of PPS

gkasprow commented 9 months ago

We have also an idea to add WR timing receiver to this card

gkasprow commented 9 months ago

We must add a GPS receiver and some Arduino module to implement this approach. The Arduino counts 10MHz/2 cycles using its timer and compares it with the PPS pulse-adjusting DAC. This can, of course, be implemented in the Kasli because our module feeds a 10MHz signal to the controller and exposes DAC. One needs only to connect PPS to DIO. But more convenient would be independent timing input and local processing.