One way is to divide by 10 and then multiply by 16.
Divide by 10 and then follow by 4 tuned frequency doublers.
This should introduce little phase noise.
Another way to do it is to divide by 10, then pass the output thru a
narrow 16 MHz filter and amplify. Sounds difficult but the filter can be one
or two 16 MHz crystals followed by a simple amplifier. Look at the
reference input circuit for a PTS-160. The output of the divide by 10 needs to
be asymmetrical so it produces even harmonics. If you are using a
divide divide by 5&2 such as a 74HC90, divide by 2 first then by 5.
Ideally the pulse width should be a half period of 16 MHz for the maximum
harmonic content at 16 MHz.
You can take the output of the frequency divider and send it to a NAND
gate.
One input of the gate is directly connected and the other is delayed. You can
use an RC with a variable capacitor to ground to get it just right.
Just adjust the capacitor to get the maximum output from your
filter amplifier.
73
Bill wa4lav
At 07:41 PM 1/2/2013 +0000, you wrote:
What's the simplest way to generate 16 MHz from 10 MHz? This will be for
clocking a microcontroller at 16 MHz given 10 MHz (Cs/Rb/GPSDO). Low price
and low parts count is a goal; jitter is not a concern but absolute
long-term phase coherence is a must.
The ICS525 (as in TAPR Clock-Block) is a good candidate but I was
wondering if there's something cheaper, less functional, and maybe not
SSOP. Any suggestions?
Thanks,
/tvb
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