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-boun...@febo.com [mailto:time-nuts-boun...@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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.