[time-nuts] Thermal noise contribution to phase noise

Bruce Griffiths bruce.griffiths at xtra.co.nz
Tue Jan 15 19:38:14 UTC 2013


I've noticed a disturbing tendency to quote the thermal noise 
contribution to phase noise as -174dBm/Hz instead of the corrent value 
of -177dBm/Hz as verified by measurement by NIST:
http://tf.nist.gov/phase/noisemeas.html

This error occurs in papers from Spectrum Microwave, Wenzel Associates 
and others.
Blindly propagating the results quoted in the early literature isnt 
particularly helpful given that the definition of SSB phase noise has 
changed in the intervening decades.

Bruce



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