Piezoelectric vibration based energy harvesting systems have been widely utilized and\nresearched as powering modules for various types of sensor systems due to their ease of integration\nand relatively high energy density compared to RF, thermal, and electrostatic based energy harvesting\nsystems. In this paper, a low-power CMOS full-bridge rectifier is presented as a potential solution\nfor an efficient energy harvesting system for piezoelectric transducers. The energy harvesting\ncircuit consists of two n-channel MOSFETs (NMOS) and two p-channel MOSFETs (PMOS) devices\nimplementing a full-bridge rectifier coupled with a switch control circuit based on a PMOS device\ndriven by a comparator. With a load of 45 k�©, the output rectifier voltage and the input piezoelectric\ntransducer voltage are 694 mV and 703 mV, respectably, while the VOUT versus VIN conversion ratio\nis 98.7% with a PCE of 52.2%. The energy harvesting circuit has been designed using 130 nm standard\nCMOS process.
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