I've read that the so-called regenerative frequency divider has exceptionally low phase noise. You could cascade four of them, each dividing by 3. It's not the simplest thing in the world, but might yield really good phase noise performance. Back when I worked at TEK on the 2710 (low-cost SA) project, late 1980's, one of the engineers used one of these to divide a signal of around 2 GHz by 2; these were the days when IC dividers that would work that fast were either unobtainium or unaffordable.
See: http://www.ke5fx.com/regen/1208.pdf and note the reference to the IEEE paper. Dana On Thu, Jun 18, 2020 at 11:38 AM Mike Ingle <[email protected]> wrote: > Hi Gilles, I didn't peruse the linked paper, but I usually use a re-sync > FF MC100ep51 or 52 with the clock at the pre-divider rate, and the "D" > coming from in my case an FPGA. thai eliminates the phase noise > contributed by the FPGA. The nice thing with an FPGA, is you can use the > LVDS outputs into the differential ECL D pretty easily. And ECL is > clean. --mike > > On Thu, Jun 18, 2020 at 5:42 PM Gilles Clement <[email protected]> wrote: > > > Hi > > I need to divide the output of an OCXO by a factor D=81 for testing > > purposes. So with minimum added phase noise. > > PICDIV-like approches would not work (D needs to be divisible by 8 or at > > least be even) > > I went through the archives and it seems that an Injection Locked > > Frequency Divider with resynchronization flip-flop could be a simple and > > acceptable solution. > > As described in the following Wenzel paper: Unusual Frequency > > Dividerswww.wenzel.com › uploads › dividers < > > > https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwik49qGpIvqAhURahQKHTBVClAQFjABegQIARAB&url=http%3A%2F%2Fwww.wenzel.com%2Fwp-content%2Fuploads%2Fdividers.pdf&usg=AOvVaw2m-9lURROiSbG9XykiDNDU > > > > > Does this make sense? > > Gilles. > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
