Abstract
This work investigates the phase noise (PN) performance optimization technique based on phase feedback scheme demonstrated by a 10MHz multiple-port piezoelectric support transducer oscillator. An additional phase-locked loop (PLL) is implemented on two distinct support transducers as a secondary loop to enable precise damping and stiffness control through force-feedback. A wide quality factor (Q) tuning range of up to 41 % (Q = 7, 175 - 10, 161) is attained within full force-feedback phase of 2p, thereby improving an overall PN performance by 7.1dB. Moreover, the amplitude of the feedback tuning voltage (Vi) is also a key to PN reduction, which features a 10.5dB/V improvement at 1kHz offset. This technique has proven its potential as a key architecture for future low phase noise oscillators and resonant sensors.