  (RFT) allows very high-Q active mode resonators, promising crystal-less
monolithic clock generation for mmWave systems. However, there is a strong need
for design of mmWave oscillators that utilize the high-Q of active-mode RFT
(AM-RFT) optimally, while handling unique challenges such as resonator's low
electromechanical transduction. In this brief, we develop a theory and through
design and post-layout simulations in 14 nm Global Foundry process, we show the
first active oscillator with AM-RFT at 30 GHz, which improves the fundamental
limits of phase noise and figure-of-merit as compared to the oscillators with
conventional LC resonators. For AM-RFT with Q factor of 10K, post layout
simulation results show that the proposed oscillator exhibits phase noise less
than -140 dBc per Hz and figure-of-merit greater than 228 dBc per Hz at 1 MHz
offset for 30 GHz center frequency, which are more than 25 dB better than the
existing monolithic LC oscillators.
