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

[Bill Byrom]

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.

The slide deck was not available for download during the webinar. The webinar is now available after the fact on-demand by using the link given earlier (https://www.naylornetwork.com/mtt-mkt2019/email01.asp?projID=122255) and then scrolling down to the "Notify Me!" button, which takes you to the event lobby page. The green box link at the bottom toggles on/off the Resources window. Click "Webinar Evard York" to download a 3 MB PDF of the slides (for slides per page).
--
Bill Byrom N5BB



On Thu, Oct 8, 2020, at 9:41 AM, jimlux wrote:
> https://www.naylornetwork.com/mtt-mkt2019/email01.asp?projID=122255
> 
> 
> There's a registration link at the above page.
> 
> 
> 
> Low Phase Noise Signal Generation Utilising Oscillators, Resonators & 
> Filters and Atomic Clocks
> 
> 
> Tuesday, October 13, 2020 - 12:00 PM Eastern Daylight Time
> 
> Abstract:
> 
> Oscillators and atomic clocks are used in almost all electronic systems. 
> They set the timing of operations and clock elements as required. The 
> phase noise, jitter & stability of these oscillators often sets the 
> ultimate performance limit. Oscillators requiring low phase noise are 
> used in communications, control, RADAR and navigation systems and also 
> as flywheel oscillators for atomic clocks, particle accelerator systems 
> and Very Long Base Interferometry (VLBI) systems. This talk will 
> initially discuss the theory and design of a wide variety of oscillators 
> offering the very best performance. Typically, this is achieved by 
> splitting the oscillator design into its component parts and developing 
> new amplifiers, resonators and phase shifters which offer high Q, high 
> power handling and low thermal and transposed flicker noise. Key 
> features of oscillators offering the lowest phase noise available will 
> be shown, for example: a 1.25GHz DRO produces -173dBc/Hz at 10kHz offset 
> and a noise floor of -186dB and a 10 MHz crystal oscillator shows 
> -123dBc/Hz at 1Hz and -149 at 10Hz. New compact atomic clocks with 
> ultra-low phase noise microwave synthesiser chains (with micro Hz 
> resolution) will also be briefly described to demonstrate how the 
> long-term stability can be improved. New printed resonators (and thereby 
> filters) demonstrate Qs exceeding 540 at 5GHz on PCBs and > 80 at 21GHz 
> on GaAs MMICs. These resonators produce near zero radiation loss and 
> therefore require no screening. L band 3D printed resonators demonstrate 
> high Q (> 200) by selecting the standing wave pattern to ensure zero 
> current through the via-hole and new ultra-compact versions (4mm x 4mm) 
> have been developed for use inside or underneath the package. Alumina 
> based resonators demonstrating Qs >200,000 at X band have also been 
> produced. Tuneable versions (1%) have recently been developed. Jeremy 
> presented the first course on oscillators including a lab class at the 
> IEEE International Microwave Symposium in Boston in 09. This was 
> repeated in 2010, 2011. A battery powered lab kit offering 5 experiments 
> with full theoretical and simulation support was provided. The kit also 
> produced state-of-the-art performance with flicker noise corners around 
> 200Hz. The methodology behind this course will be described. Theory and 
> 5 experiments on the same day was part of the reason for success. The 
> next generation of oscillators will offer orders of magnitude 
> improvement in performance. Our current attempts to do this will be 
> described.
> 
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