| Summary: | In this paper, the design and experimental validation of an active rectifier for ultrasound-based implanted biomedical devices are presented. One of the main contributions is the adoption of an optimized design procedure based on the <inline-formula> <tex-math notation="LaTeX">$g_{m}/I_{D}$ </tex-math></inline-formula> of the transistors. Implemented in a 28-nm CMOS technology and powered by a 0.5-mm thickness and 1-mm2 surface area piezoelectric transducer, the rectifier delivers 1-mW of power to the output load. The adoption of a square wave to drive the transmitting power transducer is experimentally demonstrated to be more power effective. The rectifier exhibits a measured peak power conversion efficiency and a power density equal to 95% and 222mW/<inline-formula> <tex-math notation="LaTeX">$mm^{2}$ </tex-math></inline-formula>, respectively, revealing itself as the best trade-off between measured power conversion efficiency and power density within the literature of US-powered AC/DC converters.
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