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Article #2152Re: Phase detector for huge jitter ??
From: Tim Wescott
Date: Wed, 21 Apr 2004 16:34
Date: Wed, 21 Apr 2004 16:34
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2718 bytes
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. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,3cfe9391bca22339 X-Google-Attributes: gid112d1e,public X-Google-Thread: 112e71,3cfe9391bca22339 X-Google-Attributes: gid112e71,public X-Google-Thread: 107cee,3cfe9391bca22339 X-Google-Attributes: gid107cee,public X-Google-Thread: 103407,3cfe9391bca22339 X-Google-Attributes: gid103407,public X-Google-ArrivalTime: 2004-04-21 09:33:59 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!news.glorb.com!border1.nntp.ash.giganews.com!nntp.giganews.com!newshosting.com!nx01.iad01.newshosting.com!sn-xit-03!sn-xit-06!sn-post-02!sn-post-01!supernews.com!corp.supernews.com!not-for-mail From: Tim Wescott <tim@wescottnospamdesign.com> Newsgroups: sci.electronics.design,de.sci.electronics,aus.electronics,sci.electronics.misc Subject: Re: Phase detector for huge jitter ?? Date: Wed, 21 Apr 2004 09:34:13 -0700 Organization: Posted via Supernews, http://www.supernews.com Message-ID: <108d8jmol9jtt01@corp.supernews.com> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6) Gecko/20040113 X-Accept-Language: en-us, en MIME-Version: 1.0 References: <c66585$b9u$1@nemesis.news.tpi.pl> <ih6d80tp5je4djjbel7arquapcnur003m9@4ax.com> In-Reply-To: <ih6d80tp5je4djjbel7arquapcnur003m9@4ax.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@supernews.com Lines: 40