A high Power Conversion Efficiency CMOS Rectifier Using LC Resonator Technique for Energy Harvesting Applications

A non-linear LC resonator technique is proposed for differential-drive cross-coupled (DDCC) Rectifier's structure, with applications in efficient portable-to-portable wireless charging. The proposed circuits improved the performance for a wide range of input power from −13dbm to 13dbm in 933 MHz. In the differential-drive cross-coupled (DDCC) Rectifier's structure, the received signal from the antenna is directly connected to the gates of the transistors. In the proposed structure an off-chip inductor series with a non-linear parasitic capacitance forms a resonator which increase the amplitude based on the input signal power. The voltage conversion ratio in non-linear resonator is high for low input power, while this ratio is low for high input power. Simulation result using CMOS 180nm technology shows a maximum of 68.26% in power conversion efficiency (PCE) with an input power of 8dbm with 10k load resistance and output DC voltage of 5.97V.