[time-nuts] 10 MHz -> 16 MHz

[Magnus Danielson]

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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