Thank you, Bruce!!! That is exactly the information I was looking for. I sincerely appreciate the help.
-CH On Jul 19, 2012, at 12:47, Bruce Griffiths <bruce.griffi...@xtra.co.nz> wrote: > The problem of optimal zero crossing detector design was essentially solved > by Oliver Collins in the 1990's. > Essentially a series of cascaded limiter stages with appropriate gain and > bandwidth distribution are used. > With a 10MHz 1V rms signal only 2-3 stages suffices. > However unless you need fs jitter less complex zero crossing detectors should > suffice. > > 1) a comparator (or line receiver) based design should achieve sub 10ps > jitter. > > 2) AC coupling to the input of a CMOS (AC04, AHC04 LVC04) should achieve a > jitter of 1ps or less > > 3) A simple differential pair with AC coupled emitters (reduces asymmetry due > to component tolerances ) is capable of sub ps jitter. > > There is a spreadsheet to assist design of Collins style zero crossing > detectors at: > > http://www.ko4bb.com/~bruce/ZeroCrossingDetectors.html > <http://www.ko4bb.com/%7Ebruce/ZeroCrossingDetectors.html> > > Bruce > > > paul swed wrote: >> you can search time-nuts there has been a number of very good discussions >> on this. >> Sorry to say how you search is equally a good question. >> >> On Thu, Jul 19, 2012 at 3:19 PM, Chris Hoffman, KG6O<cq.k...@gmail.com>wrote: >> >> >>> Thank you, Azelio! I don't suppose there's an impromptu FAQ page out >>> there, is there? >>> >>> -CH >>> >>> On Jul 19, 2012, at 11:58, Azelio Boriani<azelio.bori...@screen.it> >>> wrote: >>> >>> >>>> This is sort of a FAQ: the argument was already discussed here. One of >>>> >>> the >>> >>>> most interesting idea (in my opinion) is to use an RS485 line receiver >>>> >>> like >>> >>>> the ST3485, MAX483, ADM485. They are actually transceivers so they must >>>> >>> be >>> >>>> tied permanently in RX. Since they are differential you can also put a >>>> >>> 1:1 >>> >>>> (or a 1:4 to raise the level) transformer to isolate the input too. >>>> >>>> On Thu, Jul 19, 2012 at 6:03 PM, Chris Hoffman<cq.k...@gmail.com> >>>> >>> wrote: >>> >>>> >>>>> Can anyone suggest a good reference design for a zero-crossing >>>>> >>> detector? I >>> >>>>> am trying to home an ADC sampler trigger to the 1VRMS (50ohm) 10MHz sin >>>>> from my XL-DC... And now I'm thinking that I should just home the uC >>>>> >>> clock >>> >>>>> to it, as well. >>>>> >>>>> Essentially, I believe that I'm looking for an efficient, stable, and >>>>> accurate sine-to-square converter... and I'll welcome any advice in this >>>>> area. >>>>> >>>>> This may also be used in a 1KHz 5Vpp IRIG-B decoder... I don't feel like >>>>> rectifying the signal, to be honest. I want to try to keep a smaller >>>>> >>> BOM, >>> >>>>> sense the waveform primarily, and crunch numbers inside the uC. >>>>> >>>>> >>>>> -CH >>>>> >>>>> Chris Hoffman >>>>> cq.k...@gmail.com >>>>> http://ar.ctur.us >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- time-nuts@febo.com >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>>> >>>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to >>>> >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> >>>> and follow the instructions there. >>>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.