A Low-Power Single-Chip Internet of Things Transponder with Energy Harvesting

A low-power single-chip Internet of things transponder that provides automotive security passive keyless entry is presented. To guarantee high reliability under poor conditions, the transponder can switch the power supply between the low-frequency field and its internal battery seamlessly when using the proposed intelligent power management scheme. Measurement results show the improved full-wave rectifier produces 72% high-efficiency conversion from low-frequency AC to DC voltage for energy harvesting, and an enhanced amplitude-shift keying demodulation guarantees reliable data transmission at low power.