Talk:Phase noise

message: Does phase noise effect the \varphi_0 in \cos(\omega t + \varphi_0), so it isn't static anymore but changes a little to smaller and higher values? --Abdull 09:49, 19 August 2005 (UTC)
replies: text: Yes. 67.198.37.17 (talk) 17:20, 13 April 2019 (UTC)
thread_title:  Question

message: *I found the article on dBm to be very useful, with some extension the dBc article could be equally useful.
*I would say there is a clear distinction between the unit dBc and the phenomenon of phase noise.
*Given the lack of information in the phase noise article, I would say there isn't even short-term benefit to the merger.DJIndica 22:12, 23 March 2006 (UTC)
thread_title:  Arguments against proposed merger 

message: Article says "For example, the phase noise may be -40 dBc integrated over the range of 1 kHz to 100 kHz. This Integrated phase noise (expressed in degrees) can be converted to jitter (expressed in seconds) using the following formula.
Jitter(seconds) = PhaseError(degrees) / (360xFrequency(hertz))"
but could it be made clearer how to convert the integrated phase noise from dBc to degrees. Rod57 (talk) 15:22, 22 October 2008 (UTC)
replies: text: The answer may be in here  Rod57 (talk) 22:32, 22 October 2008 (UTC)
thread_title:  Example conversion to degrees 

message: Is PSD Power Spectral Density?  Expanding acronyms seems helpful.
--Denimskater (talk) 22:22, 31 October 2017 (UTC)
thread_title:  PSD 

message: I think there should be a word between the and of in "is one half the of the double-sideband spectral density of phase fluctuation". Any suggestions? ϢereSpielChequers 08:25, 21 April 2016 (UTC)
replies: text: Thanks for catching that. As seen in a draft of IEEE STD 1139, the phrase should be "one half of the double-sideband spectral density of phase fluctuations", so there was an extra "the" and fluctuation should be plural--in phase noise, there is never just one fluctuation. I've made the change. --Mark viking (talk) 09:06, 21 April 2016 (UTC)
replies: text: Thanks Mark, much appreciated. ϢereSpielChequers 16:29, 21 April 2016 (UTC)
thread_title: The Of

message: According to the definitions, ℒ(f) is the spectral content (relative to the carrier) of pure phase noise in a single sideband.   Sφ(f) is the phase error relative to signal amplitude when measured on a phase detector.  It seems to me that the two ℒ(f) sidebands add coherently to create Sφ(f), so the difference should be 6-dB.   If this is correct, and we are expressing ℒ(f) and Sφ(f) as power relative to carrier we should have ℒ(f)=Sφ(f)/4.  Of course we often see both these measures these expressed in terms of relative amplitude, so I'm not clear which of the various options I am misinterpreting.   Can someone provide some clarity here?  ThanksPhysicistQuery (talk) 21:57, 13 July 2016 (UTC)
replies: text: Who says the noise in one sideband is coherent with the noise in the other sideband? Glrx (talk) 22:10, 13 July 2016 (UTC)
replies: text: The general issue is that this article is very nearly incoherent, with no continuity from one equation to the next, no definitions of terms, no derivations, no provable or proven claims. Its sort of a concept-salad. A better version of this article might (for example?) start with φ(t) some random walk with some power spectrum and then properly define ℒ(f) and  Sφ(f) and show what happens to these, in each side-band. Or conversely, start with noise in the sidebands and derive phase noise. Or something, anything would be better than what we have now.  Seem's like Leeson's equation is some kind of start for actual oscillators, so the question is, how to back away from Leeson's equation and Allan variance and get to some clear, generic, understandable statements? 67.198.37.17 (talk) 17:36, 13 April 2019 (UTC)

text: The articles on flicker noise and oscillator phase noise are in even worse shape. Oi. 67.198.37.17 (talk) 18:00, 13 April 2019 (UTC)
thread_title:  ℒ(f)=Sφ(f)/2 

message: I propose that Oscillator phase noise be merged to this page. The content in Oscillator phase noise page is not much and can be easily merged to this page. It would also make it more coherent by putting things in one place. pony in a strange land (talk) 07:30, 20 October 2016 (UTC)
replies: text: Closing, given uncontested opposition and no support. Klbrain (talk) 09:55, 20 May 2018 (UTC)
thread_title:  Merger proposal 

message: "The IEEE defines phase noise as ℒ(f) = Sφ(f)/2 where the "phase instability" Sφ(f) is the one-sided spectral density of a signal's phase deviation.[4] Although Sφ(f) is a one-sided function, it represents "the double-sideband spectral density of phase fluctuation".[5][clarification needed] "
Is it one-sided or two-sided then?
2601:646:8300:10:A548:E8D8:258F:12B2 (talk) 00:05, 19 December 2020 (UTC)
thread_title:  One-Sided vs Two-Sided