Hi Just about any of the high speed CMOS parts should work. A 74AC86 is about the earliest part I would trust. Any of the fast logic families that came after that should do equally well.
Bob On Dec 5, 2012, at 7:03 AM, Hans Rosenberg <hrosenb...@catena.nl> wrote: > Hello Time-nuts, > > I have to do a phase noise measurement and I'm wondering if anyone here has > any ideas on that. We have to measure the phase noise of a 125kHz carrier > (5Vp-p signal level). The measurement system should have a noise floor that > is -164dBc/Hz at a distance of 1kHz to 8kHz away from the carrier. > > Our current plan is to use 2 of these sources, have one in free running mode > and lock the other one to the first one using an XOR gate and then use the > output of the XOR gate as an output signal. However, we are wondering if any > of you know a better idea. Maybe there is an off-the-shelf piece of equipment > that can do that that we could rent. Or maybe we could increase the frequency > to a few megahertz using a pll, which means the signal comes into the > measurement range of our FSUP phase-noise analyzer. Problem is, the phase > detector would then need to have an insanely low noise-floor (in our idea the > XOR also has to have this insanely low noise floor as well off course) so > does anyone have experience with anything like this? Does anyone know an XOR > with these good specs? I don't have a clue what a standard 74lvc1g86 would > do. Needless to say the supply of this XOR would have to be ridiculously > clean, but I do have a solution for that problem. > > Any help is greatly appreciated! > > Best regards, > > Hans Rosenberg > _______________________________________________ > 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.
