Hi As noted in another post, the phase detector guys talk about a figure of merit that is not directly comparable to the floor of a DBM. If I translate the -170 dbc/ Hz at 100MHz on the DBM, to the PLL chip FOM, I would add 80 db. That would make it a -250 dbc FOM vs the -231.
Since the FOM stuff does not really apply to a DBM approach, you would never see this done. One works one way, the other works in a very different fashion. Bob > On Jul 8, 2022, at 8:19 PM, Mike Monett via time-nuts > <[email protected]> wrote: > > To Bob kb8tq. You wrote: > >> Hi > >> The noise floor of the double balanced mixer (used as a phase >> detector at 100 MHz) is in the -165 go -170 dbc / Hz range. I've >> used the parts you are talking about. Their floor is *way* higher. > >> Bob > > I stated the MC100EP140 would not match the Hittite HMC984LP4E. It has > -231 dBc/Hz noise. > > -231 dBc is *way* lower than -170 dbc. About 60 dB lower. > > You might be interested in trying it. Only $13.25 at Arrow: > > https://octopart.com/search?q=HMC984LP4E > > Thanks, > > Mike > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe send an email to [email protected] _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe send an email to [email protected]
