Open AccessA High Efficiency and High Power Density Active AC/DC Converter for Battery-Less US-powered IMDs in a 28-nm CMOS Technology
Author(s) -
Andrea Ballo,
Alfio Dario Grasso,
Marco Privitera
Publication year - 2024
Publication title -
ieee access
Language(s) - English
Resource type - Journals
ISSN - 2169-3536
DOI - 10.1109/access.2024.3351934
Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation
In this paper, the design and experimental validation of an active rectifier for ultrasound-based implanted biomedical devices are presented. The circuit is designed by adopting an optimized design procedure based on the g m / I D of the transistors. Implemented in a 28-nm CMOS technology and powered by a 0.5-mm thickness and 1-mm 2 surface area piezoelectric transducer, the rectifier delivers 1-mW of power to the output load. It exhibits a peak power conversion efficiency and a power density equal to 95% and 222 mW/ mm 2 , 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.