Martyn Smith wrote:
Hi All,
I read Garry's email about using the 74AC04 as a distribution amplifier.
Did I read it right, does Gary say you will get -178 dBc/Hz at 10 kHz
offset???
Being one of only 3 or 4 companies in the world that manufactures
distribution amplifiers that break the -170 dBc/Hz region at 10 kHz
offset, in my experience any logic gate or Op amp will limit you to
about -155 dBc/Hz at offsets of 10 kHz and beyond.
I've tested many competitive units and very few people get below -155
dBc.
I'm not about to say how we achieve -170 dBc/Hz phase noise, but we
definitely don't use op amps or logic gates!!
Regards
Martyn
Actually the phase noise was supposedly -178dBc/Hz or lower for offsets
of 100kHz or more.
This is potentially possible if a high Q (>1000?? for a 10MHz input )
tuned circuit suitable bandpass filter were used.
Extrapolating the measured phase noise of a divider to that of an
inverter doesn't predict the inverter noise accurately as the divider
output includes noise due to aliasing of its wide band input noise etc.
One actually has to measure it with an accurately calibrated phase noise
measurement setup.
Bruce
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