[time-nuts] Re: Working on a low-phase-noise frequency multiplier

[Wilko Bulte]

hello Bill,

You might be interested in this one

http://www.timeok.it/wp-content/uploads/2015/08/high-performance-frequency-doublerv1-31.pdf

best,
Wilko

> On 25 Aug 2023, at 20:02, Bill Ezell via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> I have some old frequency standards that provide 1, 2.5, or 5 Mhz outputs, not great for comparing against modern 10Mhz standards.
> 
> I could do a divider, pretty easy, but only useful for doing analysis. Better to have 10Mhz output.
> 
> So, I'm thinking a multiplier. There are many versions, from simple diode ones and up.
> 
> It seems that doing an integer-N PLL with a VCXO would be the way to go. The capture range can be quite narrow since the input will be something that's within a 1 Hz range and a long loop constant might be good. Plus, with a good-quality VCXO, I would expect the noise figure to match the VCXO's pretty closely.
> 
> Any comments before I wander off into la-la land? BTW, Analog Devices has some good PLL design tools.
> 
> So, what sparked this? I bought one of the Sulters that was mentioned a while back, 2.5Mcycles (gotta be historically accurate). I also have an equally-ancient Vectron double-oven std that, last I tested it, was down in the e-11 or better range. I also got a TinyVNA which is now a TinyPFA, and it can only deal with equal freq inputs. I want to also compare that against my HP 5370 and 53310. You can see the slippery slope.
> 
> Thanks, Bill
> 
> -- 
> Bill Ezell
> I happen to know that this is the Lupin Express.
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