Why not use something like an HP5254B/C ? They give out 50MHz harmonics up to the low Ghz region, all filtered by a nice high-Q tuneable cavity. All to typical HP build quality. Of course, they have an amount of 'not needed' circuitry and are just a bit ..... , well, bulky. Good clean output from 10MHz in though.
Paul G8GJA -----Original Message----- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Peter Reilley Sent: 21 January 2016 15:17 To: time-nuts@febo.com Subject: Re: [time-nuts] low noise multiplication to 100 MHz Have you considered synthesizers? I am using an Analog Devices AD9517 to drive a A/D converter at 250 MHz. It has many clock outputs that are independently configurable. It is intended for low jitter applications. Pete. On 1/21/2016 9:43 AM, jimlux wrote: > My tiny 100 MHz low noise OCXOs are unexpectedly delayed at the mfr, > and I'm looking at alternative schemes. > One is to get 10 or 20 MHz OCXOs (typically in stock) and multiply > them up. I've got the Wenzel ap notes on 2diode and using HCMOS (and > I've used the packaged Wenzel multipliers), and I think I have some > spare board real estate on another board. > > The 2diode multiplier describes using 1n5711 or 1n914, but I was > wondering if anyone has run this sort of multiplier up to 100 MHz? > > What sort of symmetry does the resulting waveform have (yeah, it's > basically a filtered sinewave, because you're picking a harmonic, but > I've been surprised before)? > > > > > I'm driving an FPGA and a couple of ADCs. The ADCs have differential > input that is 10kohms with 9pF in parallel offset from ground in the > usual way (we're using a transformer and appropriate bias resistors). > Not a 50 ohm load, in any case. And it wants a clock that is high for > about 47.5% to 52.5% in one mode and much wider (30%-70% in another).. > I need to check. > > The FPGA is less critical noise-wise, and has a AD8138 buffer in any > case, which can fix a variety of evils. > > > > _______________________________________________ > 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.