If not good enough an XOR with filter and one of the Crystek VCXO's previously mentioned may do it. Bert Kehren In a message dated 1/25/2016 10:01:33 A.M. Eastern Standard Time, [email protected] writes:
Also, it will be systematic, with idle tones. Because of the delay elements used, they will not be long-term static but move around. I agree, this is quite noisy. If the noise is tolerable, it is indeed a small solution. 100 ps 1-sigma for 5 MHz in 100 MHz out isn't what I would consider low. https://www.idt.com/document/dst/570-datasheet Cheers, Magnus On 01/24/2016 11:12 PM, Bruce Griffiths wrote: > Unfortunately the ICS570 (like all zero delay buffers) has an output jitter approaching about 1000 times the likely RF ADC internal sampling jitter. The resultant SNR degradation may be a little excessive for this application.. > Bruce > > > On Monday, 25 January 2016 11:00 AM, Bert Kehren via time-nuts <[email protected]> wrote: > > > With all the discussions in a small 100 MHz source I asked my project > partner Juerg in Switzerland to run some data on the ICS 570 that we use on the > majority of our projects with excellent results. Using the HP53132A we see > + - 1 count at E10-11 ignore the large jumps those come from the Tbolt > frequency change to correct the 1 pps. Depending on the application this is an > excellent device. > Bert Kehren > > > In a message dated 1/23/2016 6:02:23 P.M. Eastern Standard Time, > [email protected] writes: > > Am 22.01.2016 um 22:40 schrieb jimlux: >> the oscillator is a HCMOS output, so figure swinging about 3.5V >> Output.. I'm feeding differential clock inputs on ADCs. I'll bet a >> +/- 300mV swing would work. >> >>> 4)Title said "Low Noise" needs better definition as to what kind of >>> noise and how far down. Are we to be concerned about harmonic and spur >>> content as compared to real random white noise? >> >> This is time-nuts.. it has to be perfect.. >> >> But realistically, my source is probably going to be about -90dBc/Hz >> at 1 Hz, -125 at 10Hz, -145 at 100 Hz. I'm going up by a factor of >> 10, so I'd expect 20 dB worse plus a little..(nothing is perfect, eh?) >> >> Call it maybe -100 to -95 at 10 Hz, -125 to -120 at 100 Hz and so forth. >> >> harmonics are interesting: it's the sample clock into an ADC. So >> harmonics of the 100 aren't a big deal. harmonics of the 10 or 20 >> are. If you have significant 90 or 110 contaminating the 100, then >> you get weird spurs.. (I had this problem on a software radio where >> the 50 MHz sample clock was contaminated with some 66 MHz from the CPU) >> >> Spurs cause the same issues. >> >> ON the other hand... spurs that are pretty low don't make much >> difference if you're digitizing a signal that is close to the noise >> floor: the spur multiplied by the desired signal is usually lower and >> down in the noise. Strong CW in band signals, though, are a real pain. >> >> > < > https://picasaweb.google.com/103357048842463945642/Tronix#607927018804883377 > 8 >> > > I think that top left board would not be far away: > > in : 10 MHz LVDS or CMOS > in: 3V3 > out: 100 MHz CMOS 3V3 > > just a few hours wall clock time from layout to working as a > ham radio weekender, so please excuse my diy home board > production process. > > Ok, the use of a 4046 descendant may not be the last word > from a timenut perspective, but I'll redo it with an osc of > my own anyway. Divider 100/10 is a LVC163 (161?) + lvc04. > > > < http://www.crystek.com/crystal/spec-sheets/vcxo/CVHD-950.pdf > > > Digi-Key has 153 of them on a tape and 441 of a similar one , even > cheaper that seems to point to the same data sheet. > > < > http://www.digikey.de/product-detail/de/CVHD-950-100.000/744-1213-ND/1644128 > >> > You can get the few dB missing close-in by transfer from your reference. > > In the picture: > The bottom row of boards is a doubler 100->200 MHz using 2*BF862, slight > gain, > and diode doubler 200 -> 400 MHz, SAW filter to get rid of > 100/200/300/500/600 +/-10 etc, > post amp to get a usable level again. > > Still missing 400-> 800, 800->1600 to feed _my_ ADC clock input.. > > regards, Gerhard > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
