[time-nuts] 10 MHz -> 16 MHz

Magnus Danielson magnus at rubidium.dyndns.org
Sun Sep 30 16:53:43 EDT 2018


Hi,

There is clearly enough clock chips today that would fit the bill and
probably provide good enough jitter for you to operate it safely.
Look at products like this:
https://www.silabs.com/products/timing/clocks/general-purpose-clock-generators

There is more of them as you look around.

Then, also consider classic mixer-approach, which may be workable or not
for you:

Square the 10 MHz, feed into a tuned tank for 30 MHz, amplify and
square, divide by 5, mix produced 6 MHz with 10 MHz and amplify into a
tuned tank at 16 MHz, buffer and square as needed for output.

However, for the application at hand I would look at the modern clock
generator chips that has come a long way. Their relatively low noise is
due to their GHz CMOS oscillators and relatively quiet dividers. The
setup gives a relatively good flexibility. Fractional divisors has come
a long way to solve more problems. You get more than the real-estate of
one of the surface mounted DBM mixers would provide you. It's when you
want to go to very low noise that you would consider another approach.

Then again, I would enjoy the challenge of the mixer approach. So choose
method based on what is most rewarding, but for simplicity the clock
chips seems like a good go, so there it is more about locating a cheap
board with the right chip on it.

Cheers,
Magnus

On 9/30/18 5:57 AM, Tom Van Baak 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
> 
> 
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