A 200 MHz 23 mW high-efficiency inductive link power supply circuit with differential-driven CMOS rectifier and multiple LDOs in 0.18 µm CMOS process

Abstract

A 200 MHz CMOS near-field inductive link power supply (ILPS) supplying output power of 18 mW and 5 mW under supply voltage of 1.8 V and 1 V is proposed in this paper. The CMOS power supply consists of differential-driven rectifiers and low-dropout regulators (LDOs). Two fully-integrated LDOs with the rectifiers produce output voltage 1.8 V and 1 V for supplying analog and digital circuits, respectively. The rectifier has a cross-coupled bridge configuration and is driven by a differential RF input. The measured output power conversion efficiency (PCE) is 57.02% under 15 mA maximum output current.