[time-nuts] Frequency Stability Analyzer - ZCDs

[Glen English VK1XX]

I'm currently getting schematics together for just such a box, to be 
open source etc. maybe it can be a TAPR project I dunno.

I'll release round 1 schematics shortly.

Most of my ZCD work to this point usually uses LVDS receivers either 
discrete or FPGA IOBUF....

and more lately the ADCMP572 for a 7 GHz undersampling project.  Was 
considering  16 LVDS receivers and IDELAYS to emulate a single fast 
comparator, since there is jitter anyway on the ADCMP572>> FPGA fabric 
connection. that jitter is not so much of a problem for my 7 GHz 
undersampling apps, but in applications where performance on a 1pps 
matters, with a 1 second observation ,  might need a different approach.

Happy to  incorporate / use suggestions for what people what from this 
forum...

glen


On 27/07/2019 5:02 AM, Tom Van Baak wrote:
> Yes, I'm evaluating a FSA3011 at the moment. It's a cute little unit. 
> Documentation is sparse, the jpg plots are fuzzy, "customer" support 
> is nil, but it works. My initial tests show it's ~4x worse than the 
> data sh