[time-nuts] ? phase comparison or other device

[Ulrich Bangert]

Enrico,

you are right: Both of these articles should be read with Collins's
perhaps the better (and newer!) one. 

There is however one question remaining for me: When I learned
electronics it was generally considered bad design to let an amplifier
run into limiting due to supply limitations. If limiting was needed, so
was the rule, then it should be accomplished by planned feedback, say an
pair of antiparallel diodes in the feedback path. Can you give some
comments on whether this also applies to ZCDs or if really supply based
limiting is necessary?

Best regards
Ulrich Bangert 

> -----Ursprüngliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Enrico Rubiola
> Gesendet: Donnerstag, 28. Juni 2007 16:25
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] ? phase comparison or other device
> 
> 
> Dear time-nuts,
> there is another article about zero crossing detection,
> comes after the very wise article written by my friend J. 
> Dick Cheers, Enrico
> 
http://rubiola.org/hidden/collins96comm-zero-crossing-detector.pdf
http://rubiola.org/hidden/dick90ptti-dual-mixer-dc-amplifier.pdf


Enrico Rubiola
professor of electronics

web:	http://rubiola.org
e-mail:	rubiola at femto-st.fr

FEMTO-ST Institute
32 av. de l'Observatoire
25044 Besancon, FRANCE
voice:	+33(0)381.853940 (E.Rubiola)
voice:	+33(0)381.853999 (switchboard)
fax:		+33(0)381.853998


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