Brian There are 2 parallel feedback paths one tuned to 6MHz and the other tuned to 16MHz. They can either share the same amp or use separate amplifiers. There's a NIST paper on using them to divide by factors other than 2 (e.g. 3, 5 etc). https://tf.nist.gov/general/pdf/1890.pdf
Bruce > On 04 October 2018 at 00:54 "Brian, WA1ZMS" <wa1...@att.net> wrote: > > > Bruce- > > Does such a dual conjugate regen divider use a single mixer with the BPFs in > parallel? Or are there multiple loops? I'm trying to visualize the > topology. > > I've built a few divide-by-2 regen dividers (both worked very well) but > nothing else. > > -Brian > > > > On Sep 30, 2018, at 4:25 PM, Bruce Griffiths <bruce.griffi...@xtra.co.nz> > > wrote: > > > > A low phase noise method is to use a dual conjugate regenerative divider > > with 6MHz and 16Mhz bandpass filters in the feedback loop to produce 16Mhz > > output. > > > > For 12MHz output use 2MHz and 12MHz bandpass filters in the feedback loop. > > > > Bruce > >> On 01 October 2018 at 09:05 Bob kb8tq <kb...@n1k.org> wrote: > >> > >> > >> Hi > >> > >> If (as originally specified) noise and jitter are not a big deal - there > >> are a lot > >> of chips out there like the ICS570. They are designed to do weird ratio > >> frequency > >> conversions so 10 to 12 or 10 to 16 are trivial for them. The Clockblock > >> board was > >> one way to get it all put together. > >> > >> Bob > >> > >>> On Sep 30, 2018, at 12:05 PM, Gerhard Hoffmann <dk...@arcor.de> wrote: > >>> > >>> > >>>> Am 30.09.2018 um 16:49 schrieb Attila Kinali: > >>>> > >>>> The simplest way I can think of is the following: > >>>> Use a 74LV8154 to divide the 10MHz down to 152.587890625Hz. > >>>> Use the capture timer unit of the uC to measure the phase of the > >>>> pulse. Use any kind of DAC (internal, external, PWM,...) to steer > >>>> the 16MHz VCO. Depending on how fast the timer unit runs, this > >>>> will give you something in the order of 10-200ns dead-band. > >>>> By choosing the right frequency for the timer unit, one can > >>>> get it to "dither" a bit and then use averaging. > >>>> > >>>> For lower jitter, use one half of a Nutt interpolator > >>>> to get the timing difference between the 152Hz signal > >>>> and the 16MHz (ie similar to what the SRS FS740 does). > >>>> Use something akin Nick Sayer's time-to-amplitude converter > >>>> for the fine measurement. > >>>> > >>>> Same works equally well for 12MHz. > >>>> > >>>> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.