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

[jimlux]

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.