[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.
>



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