Hybrid Multistage Differential Rectifier for Indoor Light Energy Harvester in 65nm CMOS Technology

This paper presents a design of a hybrid multistage differential rectifier dedicated for indoor light energy harvesters. For the first stage, a fully cross- coupled rectifier with two additional PMOS switches is used and conventional fully cross-coupled rectifiers are cascaded for the succeeding six stages. The proposed rectifier is designed using TSMC 65nm CMOS process for a smaller chip area. With an input voltage of 0.5 V operating at 10 MHz, the circuit obtained an output voltage of 2.08 V and output current of 10.4 mA. It allows improving the output current to as much as twice the value compared to that of a conventional multistage differential rectifier structure. The maximum power conversion efficiency obtained is 43.08 %. The total core chip area is 0.052 um2. All the design underwent multiple thorough verifications and simulations using Synopsys Custom Design Tool.