Re: [time-nuts] Phase noise measurement experiment by Andrew Holme

2017-11-12 Thread John Miles
> But be aware, that measurements close to the limit of thermal noise > will make your measurement go sour. There the noise of your splitter > will cause an anti-correlation effect and the measured noise will > suddenly drop way below thermal noise. Craig Nelson and Archita Hati > from NIST,

Re: [time-nuts] Phase noise measurement experiment by Andrew Holme

2017-11-12 Thread Attila Kinali
On Sun, 12 Nov 2017 16:34:35 +0100 Magnus Danielson wrote: > > That said, it is probably worth trying what actually happens when > > using a 16bit ADC instead of 14bit. If there are any students here > > looking for a bachelor or master thesis project doing noise

Re: [time-nuts] Phase noise measurement experiment by Andrew Holme

2017-11-12 Thread Magnus Danielson
On 11/12/2017 03:57 PM, Attila Kinali wrote: On Fri, 27 Oct 2017 09:35:08 +0800 "Li Ang" <379...@qq.com> wrote: I just found Andrew recently post a phase noise measruement page on www.aholme.co.uk/PhaseNoise/Main.htm . Indeed a nice post, as usual for Andrew. He uses 4-channel 14bit ADC

Re: [time-nuts] Phase noise measurement experiment by Andrew Holme

2017-11-12 Thread Attila Kinali
On Fri, 27 Oct 2017 09:35:08 +0800 "Li Ang" <379...@qq.com> wrote: > I just found Andrew recently post a phase noise measruement page on > www.aholme.co.uk/PhaseNoise/Main.htm . Indeed a nice post, as usual for Andrew. > He uses 4-channel 14bit ADC to do the sampling work. -170dBc noise floor

Re: [time-nuts] Phase noise measurement experiment by Andrew Holme

2017-10-26 Thread Bruce Griffiths
The 16 bit ADCs (at least the LTC lower sample rate ones ) tend to be a few dBc/Hz quieter. However the difference is < 12 dBc/Hz. Bruce > > On 27 October 2017 at 14:35 Li Ang <379...@qq.com> wrote: > > Hi > I just found Andrew recently post a phase noise measruement page on >

[time-nuts] Phase noise measurement experiment by Andrew Holme

2017-10-26 Thread Li Ang
Hi I just found Andrew recently post a phase noise measruement page on www.aholme.co.uk/PhaseNoise/Main.htm . He uses 4-channel 14bit ADC to do the sampling work. -170dBc noise floor seems not bad for me. Since the cross correlation could reduce noise a lot, I am wondering what the