[time-nuts] Best way for generating 8994.03 MHz from 2899.00042272.....MHz?

[Rick Karlquist]

David Bengtson wrote:
> so there is one frequency that is X*(732/757), and he want to get X*3
> from this? Seems like an integer-N PLL could do this pretty
> straightforwardly, although I'd have to spend some time to figure out
> the exact multiples. National Semiconductor has an app note on
> frequency planning for synthsizers that would cover this.
>
> Dave

Yes.  The ideal architecture would be to use a dielectric resonator
oscillator at 8994 MHz as the output source.  Then divide its output by
two.  Take that ~4.5 GHz signal and divide it by 757 using the divide by N
section of an Analog Devices ADF4106.  Divide the 2998 MHz by 486
using the divide by N section of a second ADF4106.  486 is 2/3 of
732.

Feed the "muxout" of the second ADF4108 into the "ref in" of the first
ADF4108 and use the phase detector in the first ADF4108 to tune the DRO. 
(This will become clear after you read the ADF4108 data sheet :-)  The
phase detector frequency will be about 5 MHz.

Rick Karlquist N6RK