A 13.56-MHz Single-Input Dual-Output Wireless Power and Data Transfer System for Bio-Implants

A 13.56-MHz single-input dual-output (SIDO) wireless power and data transfer (WPDT) system designed for bio-implants is presented. The system incorporates a reconfigurable power amplifier (RPA) and an SIDO rectifier that generates regulated outputs of 1.2 and 2.5 V for different functional blocks of a bio-implant. A dynamic power distribution (DPD) scheme is employed to adjust the duty ratios of the outputs based on changing load conditions. The WPDT system makes use of the different reflected impedances of the two outputs to enable reliable data transfer. Implemented in a standard 65-nm CMOS process, the system achieves an uplink data rate of 423.75 kb/s, confirmed through experiments with pseudorandom binary sequence input data at distances of 6, 10, and 15 mm. Notably, the measured maximum power transfer efficiency (PTE) at coil separation of 6, 10, and 15 mm are 62.7%, 50.8%, and 32.4%, respectively, with an overall improvement of more than 20% in light-load efficiency compared to previous approaches.