[time-nuts] Close in phase noise of microwave VCOs
brooke at pacific.net
Thu Jun 18 14:47:19 EDT 2015
The DC supply in the HP 4352 VCO test set is very special in that it's output voltage has extremely low noise.
Another option is to use a battery(s) for the control voltage.
Bob Camp wrote:
> Be careful when you do find the data.
> When you go very close in on something like a VCO, you get much higher phase noise
> than we normally worry about. Some of the “assumptions” that underly the measurements
> are no longer true. Small angle of modulation is one, but there are a few others. A simple
> “plug it in and read it” may not give you valid information without some corrections. Coming
> up with a supply that’s good enough (at 1 Hz) would be a major challenge ...
>> On Jun 17, 2015, at 11:23 PM, Jim Lux <jimlux at earthlink.net> wrote:
>> On 6/17/15 1:08 PM, Magnus Danielson wrote:
>>> John Miles have been a bit active:
>>> Just to give you a start-sample.
>> those seemed to be all PLL outputs.. I didn't see the bare VCO data.
>> And, I'm really interested in the 1 Hz to 100 Hz kind of range.
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