Zhao, J., & Gao, Y. (2021). A 13.56 MHz Active Rectifier with PMOS AC-DC Interface for Wireless Powered Medical Implants. 2021 IFIP/IEEE 29th International Conference on Very Large Scale Integration (VLSI-SoC). https://doi.org/10.1109/vlsi-soc53125.2021.9606992
A 13.56 MHz active rectifier for wireless powered medical implants is presented in this paper. Only PMOS power transistors are used in the AC-DC interface in the active rectifier to prevent the inherent parasitic diode conduction that may lead to potential latch-up during the rectifier start-up period. To eliminate the reverse current introduced by the delay of comparator signal, a delay compensation loop is designed to dynamically adjust the rectifier at various DC output. A fully onchip 2× charge pump and capacitor assisted driver/sampling circuits are proposed to turn on/off the power PMOS in the rectifier. The rectifier is implemented in a standard 0.18-μ m CMOS process with a core active area of 0.4 mm ×0.9 mm. The measurement results show that this PMOS rectifier achieves peak power efficiency of 85% when load resistor is 500Ω and the DC output voltage range is 2V--3.5V.
This research / project is supported by the A*STAR - Programmatic
Grant Reference no. : A18A4b0055