At 03:01 PM 7/23/2008, Mike S wrote: >At 05:42 PM 7/23/2008, Bruce Griffiths wrote... > >Another approach is to divide the 10MHz by 5^7 (78125) and then use an > > > >injection locked multiplier chain to generate 32768 Hz from the > >resultant 128Hz output. > >It may even be possible to do the 256x multiplication using a single > >injection locked 32768Hz injection locked multiplier. > >You're missing the point. The application is to drive a common, readily >available consumer clock. Simple and cheap. It can be done with a >single $1 PIC. You could spend $20 or $100 and not get better results >for the application. If you can describe a way of doing it for $0.50, >please do.
But this is time-nuts... Any approach that doesn't have the performance of a hydrogen maser or cryogenic sapphire resonator just isn't good enough. Why, we haven't even started on how to build a radial ruling engine to make sure the clock face is precisely divided into 60 segments to ppb accuracy. Based on the clocks I've taken apart, dividing the 10MHz down to 1 Hz is probably your best bet, rather than trying to hit 32768. However, I don't know of a non-programmable single chip solution that will do a divide by 1E7. If you want programmable chips, there's countless ways, some more elegant than others. _______________________________________________ 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.