[time-nuts] Close in phase noise of microwave VCOs

[Alex Pummer]

Actually a YIG, even "standalone" has very good phase noise performance, 
as long as the tuning current is quite, once upon the time HP made some 
cheaper version of the 856x-es spectrum analyzers [ perhaps that was the 
95xx ] they had the first LO just "standing alone" no PLL,  and drifted 
away, but the phase-noise performance was not so bad. These YIGs are to 
find on e-bay sometimes,
73
KJ6UHN
Alex

On 6/20/2015 6:25 AM, Jim Lux wrote:
> On 6/19/15 9:30 PM, Bob Camp wrote:
>> Hi
>>
>> One of the most interesting things about the last paper mentioned:
>>> On Jun 19, 2015, at 8:57 PM, Charles Steinmetz 
>>> <csteinmetz at yandex.com> wrote:
>>>
>>> Rick wrote:
>>>
>>>> However, a better tutorial would be the one written by
>>>> HP's Dieter Scherer which was published in Microwaves
>>>> & RF Magazine (or possibly Microwave Journal).  I believe
>>>> the same content was available from HP as an Ap Note or
>>>> something.
>>>
>>> I suspect the paper you are referring to is:
>>>
>>> Design Principles and Test Methods for Low Phase Noise RF and 
>>> Microwave Sources (Scherer, 1978)
>>>
>>> It is available on Didier's site at:
>>>
>>> <http://www.ko4bb.com/manuals/download.php?file=03_App_Notes_-_Proceedings/Scherer_Low_noise_source_design_and_test.pdf> 
>>>
>>>
>>> There are two other Scherer papers there:
>>>
>>> Generation of Low Phase Noise Microwave Signals (Scherer, 1981)
>>> <http://www.ko4bb.com/manuals/download.php?file=03_App_Notes_-_Proceedings/Scherer_Low_PN_Signal_Generation.pdf> 
>>>
>>>
>>> The "Art" of Phase Noise Measurement (Scherer, 1985)
>>> <http://www.ko4bb.com/manuals/download.php?file=03_App_Notes_-_Proceedings/Scherer_Art_of_PN_measurement.pdf> 
>>>
>>>
>> ^^^^^^^^^ this one
>>
>>> Best regards,
>>>
>>> Charles
>>>
>>
>> is that it has a phase noise plot on an open loop microwave source 
>> down to 10 Hz. Not quite the VCO Jim
>> was looking for, but close ….
>>
>>
>
> page 25 shows down to 100 Hz, "Typical Free-Running Source at 10 GHz". 
> Eyeballing it it looks like 20dB/decade from 10-100k, a bit more from 
> 1-10k, and almost 30 dB/decade from 100Hz to 1k. I wonder what the 
> source was?
>
> The SAW is definitely in the 30dB/decade bucket
>
>
> This makes a good case for the "30dB/decade very close in"
>
>
>
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