[time-nuts] Close in phase noise of microwave VCOs
alex at pcscons.com
Sat Jun 20 20:16:10 UTC 2015
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,
On 6/20/2015 6:25 AM, Jim Lux wrote:
> On 6/19/15 9:30 PM, Bob Camp wrote:
>> 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
>>> 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:
>>> There are two other Scherer papers there:
>>> Generation of Low Phase Noise Microwave Signals (Scherer, 1981)
>>> The "Art" of Phase Noise Measurement (Scherer, 1985)
>> ^^^^^^^^^ this one
>>> Best regards,
>> 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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