[time-nuts] phase noise webinar from IEEE MTT-S

[Bill Notfaded]

I attended too.  This guy is so theoretical it was kinda hard to put into
practical terms but I will say after reading some of his book he does
understand some novel ways to calculate what's needed for reaching lower
noise levels.

Bill

On Tue, Oct 13, 2020, 1:51 PM Attila Kinali <attila at kinali.ch> wrote:

> On Tue, 13 Oct 2020 12:46:46 -0500
> "Bill Byrom" <time at radio.sent.com> wrote:
>
> > I just attended this webinar. It focused on oscillator design
> > theory and the results the author had achieved for various
> > specific projects. He discussed in general amplitude limiting to
> > reduce amplitude noise, with the result that we only need to worry
> > about phase noise in most cases. Very little time was spent on
> > atomic clocks - he gave three slides which showed Rubidium
> > resonance lines and vapor cells and a block diagram but there was
> > little else. He discussed flicker noise but didn't get into the
> > physical cause of that phenomenon. He spend a bit of time
> > discussing frequency tweaking using varactor phase shifters.
>
> A couple of notes here:
>
> Everard is a great practical guy. He knows oscillators and he
> knows them well. The papers comming out his group are great
> resources on how to build oscillators for various applications.
> I haven't had time to read his book yet, but the few pages I
> looked at gave a very good impression. If you ever meet him
> and have questions, he is very enthusiastic in answering them.
>
> About flicker noise: over a century after we discovered them,
> we still do not understand how it comes to be. A bit simplified,
> all we know is that defects increase flicker noise. But beyond
> that, we have no idea how defects causes flicker noise. So I
> am not surprised he doesn't go into that.
>
> Similarly, Rb vapor cells are not his business, oscillators and
> filters are. He probably had just a project that was used in
> an Rb standard, so it's understandable he didn't go into those
> details either.
>
> Overall the presentation was a nice overview of his works.
>
>                         Attila Kinali
>
> --
> <JaberWorky>    The bad part of Zurich is where the degenerates
>                 throw DARK chocolate at you.
>
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