Here at CERN in particle accelerators we're not looking at the same
properties for PLLs than one would require for radiocom.
Two features usually requested are very low short term phase jitters
(100fs-1ps) which directly leads into particule beam stability, as well
as being able to synchronously reset the dividers for phase sync. which
is usually not possible with integrated PLL ICs like NXP/AD/Hittite
ones.
This is also an unsual application which is not representative of mass
usage of PLLs. RF Phase stability and synchronization is a key for
accelerators performance and thus the approach is different than for
PLLs I'm designing for radiocom...
Stephane, F1TJJ
------ Message d'origine ------
De : "jimlux" <[email protected]>
À : [email protected]
Envoyé 08/03/2016 14:30:51
Objet : Re: [time-nuts] PLL book 3rd edition
On 3/8/16 12:19 AM, Stéphane Rey wrote:
Hi Rick,
There are hopefully many applications where monolythics PLL can't
achieve the requested functionalitities or performances so that there
is
still room to build block PLLs. I'm still desiging such things for my
job for instance.
As do we at JPL. In fact, I'd say that given the advent of more
"software driven" radios, with things like PLLs with DDS or NCO in the
loop, having a text that covers performance on an analytical basis is
useful.
However, it's a pretty darn small market. (Considering we do a "new
design" every 5-10 years)
And, we use the data sheets and ap notes as a much as we'd use the
textbook.
What is really hard to find is good data on the noise properties of the
other components. Everyone makes noise plots for the oscillators and
amplifiers and publishes them. For instance, what about the noise
added by the Phase Frequency Detector - that's not a spec that shows up
on the data sheet. (but does get discussed here on time-nuts)
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