[time-nuts] J06 HP-59992A time interval calibrator for HP-531xxcounters
bruce.griffiths at xtra.co.nz
Sat Jul 8 19:37:12 EDT 2017
The simplest solution to the divider and clock shaper is perhaps to use an LTC6954. The LTC6954 offers PECL/CMOS and LVDS outputs together with a low jitter (sub ps) programmable (SPI) divider (1-63).A couple of coax relays like those from Dow Key microwave together with some hardline and a couple of splitters could be used to implement the signal switching.
> On 09 July 2017 at 09:53 Hal Murray <hmurray at megapathdsl.net> wrote:
> tvb at LeapSecond.com said:
> > >
> > The PIC dividers are good to a couple ps. I suspect the larger issue is the
> > PCB and wiring design.
> > >
> What does "good" mean?
> I'd expect the variations due to power or temperature would be easy to
> Delay through classic CMOS is linear with absolute temperature and inverse
> linear with supply voltage.
> The classic way to get time-nuts level noise on FPGA outputs is to wiggle a
> nearby pin. That shouldn't be a problem with a dedicated PIC but would
> probably show up if you are generating multiple frequencies.
> These are my opinions. I hate spam.
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