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This paper reports the demonstration of an ultra-low-power micro-electromechanical system (MEMS)-CMOS oscillator for strain sensing, powered by a miniature piezoelectric vibration energy harvester (VEH). The employment of the Pierce oscillator topology in a MEMS-CMOS oscillator allows for the minimization of the power requirement to as low as $1.1~\mu \text{W}$ under ideal conditions. A VEH prototype,...
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