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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