[time-nuts] Phase Noise of 74AC gates

Martyn Smith martyn at ptsyst.com
Fri Feb 19 22:05:35 UTC 2010

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 

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!!



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