[time-nuts] 100 MHz Source

Bruce Griffiths bruce.griffiths at xtra.co.nz
Tue Apr 29 17:24:17 EDT 2008

michael taylor wrote:
> On Tue, Apr 29, 2008 at 12:46 PM, Richard W. Solomon
> <w1ksz at earthlink.net> wrote:
>> I need a 100 MHz source to lock up a F/W brick. I have 10 MHz available
>>  from my GPSDO. Anyone know an easy way to get 100 MHz using the 10 MHz
>>  source ? Maybe another PLO ?
> Run a 100 MHz oscillator in a  divide by 10  PLL (Phase Locked Loop)
> configuration, compared to your 10 MHz standard? If the Motorola /
> Freescale MC145170 (-2) was still in production, that might be a good
> one to use. Maybe National LMK03002.
> Or a PLL synthesizers that takes the 10 MHz as its input clock and
> synthesizes an 100 MHz output clock.
> An example might be, Analog Devices ADF4001
> <http://www.analog.com/en/prod/0,,770_850_ADF4001%2C00.html>.

You will achieve a much lower phase noise if you use low noise 
multipliers rather than using noisy dividers.
Unless of course you use regenerative dividers or an injection locked 

An injection locked multiplier is another option.


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