[time-nuts] 10 MHz -> 16 MHz

Francesco Messineo francesco.messineo at gmail.com
Sun Sep 30 03:05:26 EDT 2018


On Sun, Sep 30, 2018 at 5:58 AM Tom Van Baak <tvb at leapsecond.com> wrote:
>
> What's a clever, simple, reliable (pick 2 of 3) way to get 16 MHz out of 10 MHz? Low phase noise isn't a big requirement and jitter doesn't need to be sub-nanosecond. The main requirement is perfect cycle count accuracy. This is for driving a 16 MHz microcontroller from a 10 MHz Rb/Cs/GPSDO. 10 MHz input is likely sine; 16 MHz output is 3v3 or 5v CMOS.
>
> Thanks,
> /tvb

I would square the sine (like HP single BJT or double BJT squarers),
divide by 5 with any 74XX290 or xx390, then multiply by two three
times using 74XX86 XORs with one input delayed by two inverters. You
would need to play with the last inverters delay if your
microcontroller needs a symmetric clock

Frank



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