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Piezoelectric micro-power generation interface circuits

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5 Author(s)
Le, T.T. ; Sch. of Electr. Eng. & Comput. Sci., Oregon State Univ., Corvallis, OR, USA ; Jifeng Han ; von Jouanne, A. ; Mayaram, K.
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New power conversion circuits to interface to a piezoelectric micro-power generator have been fabricated and tested. Circuit designs and measurement results are presented for a half-wave synchronous rectifier with voltage doubler, a full-wave synchronous rectifier and a passive full-wave rectifier circuit connected to the piezoelectric micro-power generator. The measured power efficiency of the synchronous rectifier and voltage doubler circuit fabricated in a 0.35-μm CMOS process is 88% and the output power exceeds 2.5 μW with a 100-kΩ, 100-nF load. The two full-wave rectifiers (passive and synchronous) were fabricated in a 0.25-μm CMOS process. The measured peak power efficiency for the passive full-wave rectifier circuit is 66% with a 220-kΩ load and supplies a peak output power of 16 μW with a 68-kΩ load. Although the active full-wave synchronous rectifier requires quiescent current for operation, it has a higher peak efficiency of 86% with an 82-kΩ load, and also exhibits a higher peak power of 22 μW with a 68-kΩ load which is 37% higher than the passive full-wave rectifier.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 6 )

Date of Publication:

June 2006

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