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.
