[time-nuts] Low noise frequency multiplication
grant at ghengineering.co.uk
Thu Mar 1 09:20:08 EST 2007
>It seems there are indeed many ways to kill a cat.
More ways than you could imagine...
IMHO, a 100MHz PLL is likely to give the best results, and is very easy
to implement. A 100MHz crystal oscillator should give very low phase
noise and spur levels; crystals are readily available and there are
quite a few circuits around.
Crystal oscillators running at 100MHz or so are widely used by radio
hams for multiplication up to microwave frequencies so the phase noise
and spur levels has to be low to start with, which a VCXO can achieve.
Crystal oscillators can easily be disciplined with a varactor diode.
Various PLL configuations exist to do this and the loop bandwidth is
very narrow so the phase noise will not be degraded significantly by the
There are other ways as well, but my vote would be for the VCXO as above.
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