[time-nuts] PLL book 3rd edition

Stéphane Rey steph.rey at wanadoo.fr
Tue Mar 8 10:37:41 EST 2016


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" <jimlux at earthlink.net>
À : time-nuts at febo.com
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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