On 9/29/18 8:57 PM, 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
cycle counts over what interval? 5 and 8 cycles respectively? or over,
say, 1 second?
Multiply by 8 divide by 5 seems a bit tricky (although any number of off
the shelf DDS will do it at fairly high power dissipation)
You might be able to injection lock an 80MHz oscillator by coupling the
10 MHz in on the Vcc or output.
Then a divide by 5 down to 16.
If the requirement is over 1 second, then you can play a game with
counting the first half of the second, and adjusting in the second by
dropping/adding cycles to make it come out right. THat sounds pretty icky.
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