[time-nuts] Thermal noise contribution to phase noise

[Bob Camp]

Hi

It's not even that complex. Thermal noise is half phase noise and half
amplitude noise. The sum must equal -174.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bruce Griffiths
Sent: Tuesday, January 15, 2013 2:38 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Thermal noise contribution to phase noise

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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