On-Chip Configurable RF Energy Harvester for Biomedical Implantable Devices

This paper introduces an on-chip hybrid rectifier tailored for RF energy harvesting at 2.4 GHz. Leveraging advancements in CMOS technology, this solution offers a novel approach to powering devices, particularly suitable for implantable biomedical devices and applications. This proposed architecture features 3-stage reconfigurable hybrid rectifiers, with each stage comprising a regular threshold voltage (V-th) MOS rectifier for high input power and a low (V-th) MOS rectifier for low input power. The cross-coupled connection of both rectifiers ensures minimal ON-resistance and low reverse leakage current during forward and reverse biased conditions, respectively. Through effective reconfiguration of power paths, the proposed system achieves high power conversion efficiency across a broad input power range. This proposed system is designed and Implemented in UMC 0.18 mu m CMOS technology with a Wi-Fi frequency of ( 2.4 GHz), the measured results are demonstrating an efficiency exceeding 35% for input power levels ranging from -23 dBm to $-12$ dBm, driving a load of 40 K Omega .