[time-nuts] PLL Digital Loop Filter
kc0wjn at gmail.com
Tue Mar 21 14:37:56 EDT 2017
Roland Best, "Phase Locked Loops". I see from Amazon that it is up the
6th edition. I think I have the 3rd edition.
I took a PLL class at StorageTek a while back; an earlier revision of
this book was used and I found it to be a good text.
On 3/21/2017 9:19 AM, paul swed wrote:
> Have to say a search for PLL book by Best generates lots of stuff. None of
> it about PLLs. Better hint please? I think Lyons may be a bit better.
> On Tue, Mar 21, 2017 at 7:39 AM, Attila Kinali <attila at kinali.ch> wrote:
>> On Mon, 20 Mar 2017 21:32:28 -0700
>> James Peroulas <james at peroulas.com> wrote:
>>> I'm trying to understand how to design and analyze the loop filters in a
>>> digital PLL. Specifically, because of digital processing delays, the
>>> offset measured at time t will only produce a change on the VCXO input at
>>> time t+T, where T is the sampling period of the digital loop.
>> You have the same delays in analog filters as well. As a rule of thumb
>> you can assume that the delays are in the same order of magnitude as
>> with the equivalent analog filters, not accounting for the delays due to
>> pre- and post-processing of the signal.
>> The analysis of digital PLLs works the same as with analog ones, you
>> just exchange the Laplace transform with the Z-transform. You can add
>> arbitrary delays due to pre/post-processing as a simple multiplication
>> by 1/z for each clock cycle of delay.
>>> I've found plenty of texts describing analog loop filters. Are there any
>>> recommendations for digital loop filter PLL design?
>> The PLL book by Best contains two chapters on how to design digital PLLs.
>> I can also recommend "Understanding digital signal processing" by Lyons,
>> which is a very hands-on description how to do filters and perform other
>> signal processing tasks.
>> Attila Kinali
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