[time-nuts] Very challenging phase noise measurement, does anyone have an idea??

Adrian rfnuts at arcor.de
Wed Dec 5 21:32:55 UTC 2012


For phase noise the frequency range is 1MHz to 8/26.5/50GHz
The spectrum analyzer works from 20Hz to max.

Adrian


Azelio Boriani schrieb:
> Isn't the FSUP a 110K euros equipment 20Hz-50GHz capable? 125KHz shouldn't
> be a problem. I had an FSUP for 25 seconds to play with... really
> impressive but too limited test time to appreciate fully.
>
> On Wed, Dec 5, 2012 at 1:14 PM, Bob Camp <lists at rtty.us> wrote:
>
>> Hi
>>
>> Just about any of the high speed CMOS parts should work. A 74AC86 is about
>> the earliest part I would trust. Any of the fast logic families that came
>> after that should do equally well.
>>
>> Bob
>>
>> On Dec 5, 2012, at 7:03 AM, Hans Rosenberg <Hrosenberg at catena.nl> wrote:
>>
>>> Hello Time-nuts,
>>>
>>> I have to do a phase noise measurement and I'm wondering if anyone here
>> has any ideas on that. We have to measure the phase noise of a 125kHz
>> carrier (5Vp-p signal level). The measurement system should have a noise
>> floor that is -164dBc/Hz at a distance of 1kHz to 8kHz away from the
>> carrier.
>>> Our current plan is to use 2 of these sources, have one in free running
>> mode and lock the other one to the first one using an XOR gate and then use
>> the output of the XOR gate as an output signal. However, we are wondering
>> if any of you know a better idea. Maybe there is an off-the-shelf piece of
>> equipment that can do that that we could rent. Or maybe we could increase
>> the frequency to a few megahertz using a pll, which means the signal comes
>> into the measurement range of our FSUP phase-noise analyzer. Problem is,
>> the phase detector would then need to have an insanely low noise-floor (in
>> our idea the XOR also has to have this insanely low noise floor as well off
>> course) so does anyone have experience with anything like this? Does anyone
>> know an XOR with these good specs? I don't have a clue what a standard
>> 74lvc1g86 would do. Needless to say the supply of this XOR would have to be
>> ridiculously clean, but I do have a solution for that problem.
>>> Any help is greatly appreciated!
>>>
>>> Best regards,
>>>
>>> Hans Rosenberg
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