Micromechanical Pierce Oscillator for Resonant Sensing Applications

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We present the design techniques and experimental characterization of a Pierce oscillator circuit adapted for micromechanical elements with resonant frequencies lying between 100 and 300 kHz. Micromechanical double-ended tuning fork resonators serve as the crystal element of the oscillator. The measured phase noise of these oscillators lies below -100 dBc/Hz at a frequency offset of 500 Hz away from the carrier with in-circuit quality factors exceeding 30000. This noise figure improves upon previous reported values and demonstrates the feasibility of a Pierce oscillator for micromechanical vibrating elements with resonant frequencies lying under 1 MHz. The value of the second harmonic distortion factor (HD2) is -44 dB for an output amplitude of 50 mV.

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Journal: TechConnect Briefs
Volume: 1, Technical Proceedings of the 2002 International Conference on Modeling and Simulation of Microsystems
Published: April 22, 2002
Pages: 162 - 165
Industry sector: Sensors, MEMS, Electronics
Topics: MEMS & NEMS Devices, Modeling & Applications, Modeling & Simulation of Microsystems
ISBN: 0-9708275-7-1