Bruce, Thanks for the reminder. That was my intention. I was planning to use a 74HC74, and whatever dividers I can get my hands on. I am not looking forward to daisy chain seven 7490s, so I will probably try something else. With the D flip-flop, the dividers don't really matter, as long as the delay is below 100nS. I need to find the best way to go from the 10 MHz sinewave to the divider, probably through an LM119 comparator with modest hysteresis. The need for a low jitter divider is the same for the GPS disciplined oscillator, so I should be able to reuse the divider for my frequency standard.
Thanks Didier Dr Bruce Griffiths wrote: > Didier > > If you are going to use a PPS divider to divide the oscillator frequency > down to 1Hz, you will need to measure the inherent jitter of the divider > to ensure that it doesn't degrade the measurement resolution. It may be > necessary to resynchronise the divided output using a fast D flipflop to > reduce the inherent divider jitter to less than the 20ps resolution of > the 5370. > > Bruce > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
