Zero Loss Active Rectifier with Op-Amp for Piezoelectric Acoustic Energy Harvesting Applications in 22nm FDSOI Technology

Comparator-based active rectifier is often used in piezoelectric energy harvesting applications. However, it has mismatch problems and leakage current or oscillation that degrades its power conversation efficiency (PCE). This paper proposes a new active rectifier that is based on an Op-amp operational amplifier to address these issues. The proposed operational amplifier in the active rectifier for piezoelectric acoustic energy harvesting applications operates as a comparator but there is no oscillation or leakage current compared to the comparator as active diodes. The rectifier is designed in 22nm FDSOI technology. Simulation shows that the novel active rectifier attains a maximum power efficiency of 94.1% at 1.2V peak-to-peak AC input voltage amplitude and 300Ω loading resistor and an output voltage of 1.18V. The rectifier achieves full chip integration without the need for any external components.