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Guilar, N.J.; Amirtharajah, R.; Hurst, P.J.
IEEE journal of solid-state circuits, 2009-Jan., 2009, 2009-01-00, 20090101, Volume: 44, Issue: 1Journal Article, Conference Proceeding
Piezoelectric transducers are a viable way of harvesting vibrational energy for low power embedded systems such as wireless sensors. A proposed disk-shaped piezoelectric transducer with several electrodes enables increased energy harvesting from multiple mechanical resonances. To rectify the low-frequency AC voltage from harvested vibrational energy, a full-wave rectifier has been fabricated in 0.35 mum CMOS. Integrated peak selection circuitry allows input signals with 90deg relative phase shift from the multiple-electrode piezoelectric transducer to be rectified with reduced output ripple. The rectifier has a measured power efficiency of 98.3% while delivering 90 muW and occupying an area of 0.007 mm 2 . This high efficiency further enables energy harvesters to power wireless devices for extended durations.
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