[time-nuts] Thermal noise contribution to phase noise
Grant Hodgson
grant at ghengineering.co.uk
Sat Jan 19 09:20:24 EST 2013
Joe
Nobody is suggesting that KTB noise is revised.
Bruce's original post quoted two articles that state that the thermal
contribution to the phase noise floor of a carrier signal is -177dBm/Hz,
not -174dBm/Hz. These papers also state that there is an equal
contribution of amplitude noise which also equals -177dBm/Hz.
So the total thermal noise floor of a carrier signal is -174dBm/Hz -
half of which contributes to amplitude noise, half of which contributes
to phase noise. The quoted articles go some way to demonstrating that
by both theory and measurement.
regards
Grant
>
> ------------------------------
>
> Message: 4
> Date: Fri, 18 Jan 2013 23:52:37 -0500
> From: Joe Leikhim <jleikhim at leikhim.com>
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Thermal noise contribution to phase noise
> Message-ID: <50FA2695.1030900 at leikhim.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I have just sent off an e-mail to David Howe of NIST Metrology
> requesting clarification about this assertion that KTB is revised -3dB.
>
More information about the time-nuts
mailing list