Two things NOT to do: 1. Do NOT use ECL. CMOS is much lower jitter.
2. Do NOT use a comparator to square up the sine wave. Especially don't use a ultrafast ECL based comparator. ------------------------------------------- Some things that you should do: Make all circuitry differential if possible. Make your 10 MHz source differential by putting a transformer on the output. Band pass filter your 10 MHz source with an LC filter. I recommend Coilcraft Unicoils or Maxicoils. Rick Karlquist N6RK Bob Paddock wrote: > > Can you point me to a Time-Nut grade Zero Crossing > circuit that I can feed a Actel Igloo FPGA (It doesn't > like sine waves)? > > For the sake of discussion the source signal > is a ThunderBolt at 10 MHz. > > The FPGA is rated to 350 MHz, so no need to have > a 5.0000000000000000 GHz Zero Crossing circuit. ;-) > > The FPGA has several interface styles, > so we are not limited to just TTL or CMOS. > > Suggestions? > > > _______________________________________________ > 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.