Varèse - 10MHz reference clock

[glevethan (Gregg)]

@James

our stance on 10MHz clocks is the same as it always has been.

Refresh me again on your stance.

I seem to recall if the 10Mhz clock is more accurate than the Vivaldi clock, it will “most likely” yield some degree of improvement. I recall the specs of the SRS Perf 10 were mentioned in the old thread and were in fact more accurate (ppm?).

Dcs clock jitter specs

Yes, both of these points are correct. If you are connecting a reference clock to the Vivaldi Clock, it has to be more accurate than the Vivaldi Clock in the long term for it to have any positive impact. So, the accuracy needs to be higher than +/- 0.1 parts per million over time. Jitter (and subsequently phase noise) on a reference clock going into the Vivaldi Clock is largely irrelevant as in essence the Vivaldi Clock doesn’t respond to fast changes on the reference input - it has a slow ac…