IP개요 |
A self-powered gas sensor integrated circuit (IC) suitable for wireless sensor nodes is designed in 0.18μm CMOS process. A dual-input shared-inductor boost converter is used to harvest energy efficiently from two PV cells instead of connecting these cells in parallel when the system is exposed to gases. This shows 11% improvement of conversion efficiency at 2% H2 gas concentration. Maximum end-to-end efficiency of 88% is achieved at a maximum available power of 446.6μW from two PV cells, and the quiescent current is only 270nA. |