🚀 go-pugleaf

On Wed, 21 Apr 2004 09:34:13 -0700, Tim Wescott
<tim@wescottnospamdesign.com> wrote:

>Jim Thompson wrote:
>
>> On Wed, 21 Apr 2004 17:48:15 +0200, "5hinka" <anonim99@poczta.wp.pl>
>> wrote:
>> 
>> 
>>>How to build a phase detector??
>>>I know that normal design is two flip-fops and NAND gate but it works only
>>>with phase difference between signals smaler than 1 (T).  How could I
>>>possibly build a phase detector when phase difference between signals is up
>>>to 10-20 (T)??  It could be hole digital or digital/analog solution.
>>>Anybody know any suitable links??
>>>Greetings
>>>5hinka
>> 
>> 
>> Are you saying you have jitter that is up to 10-20*T?
>> 
>> How could you ever define that as "phase-locked"?
>> 
>>                                         ...Jim Thompson
>
>FM transmitters that use phase-locked signal generation can have 
>phase-locked loops with this much phase difference.
>
>NRZ digital signals that have gone through a number of repeaters can 
>have short-term jitter that is this severe.
>
>You define it as "phase-locked" if the average phase and frequency of 
>the locked and input signals match, and if your phase detector never 
>actually looses track.
>
>See the reference in my other thread.  I took the class from the author, 
>he really knows what he's talking about.

Classic phase detectors fail on NRZ, but there are a variety of
methods to extract a clock from such messes.

                                        ...Jim Thompson
-- 
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
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