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Wed Dec 27 09:21:15 EST 2006


characteristic by trying to lock it digitally to another high quality 100MHz
OCXO, since this kind of oscillator exceeds the performance of what is
achievable with a digital PLL IC.  In this case I would also have wasted
good money on the 100MHz OCXO.

 

It seems that the second best option (cost wise) would be to analog multiply
the 8788's output to 100MHz. Theoretically, I would then sit with the
original phase noise curved that is lifted by 20logN, where N=10, which is
about 20dBs. Thus, I would start of at -80dBc @ 1Hz and end off with a
-145dBc noise floor. (in real life I guess one would add another few dBs for
noise added by the individual components)

 

It also seems that the needed analog multipliers are a good start on one's
way to a fully analog PLL - the mixer and loop filter could be added later
if required. 

 

Could anyone point me to some analog frequency multiplier manufacturers?
(Currently I am only familiar with Wenzel (thanks Bruce)) 

 

In the mean while, it is back to the books for me - I seriously need to
catch up on some PLL theory. 

 

 

Regards,

 

Stephan Sandenbergh.

 

 

 

     



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