[time-nuts] Test equipment-level phase noise PLLs
Matt Ettus
boyscout at gmail.com
Tue Jul 22 16:16:27 EDT 2008
In looking into extremely low phase noise synthesizers, I have come
across the new HMC700LP4 chip from hittite, which seems to have the
best figure of merit I have found, -227 dBm/Hz. That gives you
-107dBc/Hz at 20 kHz offset at 6 GHz according to the datasheets.
That sounds amazingly good, but my R+S signal generator does better.
Do they use a different sort of architecture? Do they not use
conventional dividers? Some other sort of phase detector?
Thanks,
Matt
More information about the time-nuts
mailing list