A 6.78MHz Single-Stage Regulating Rectifier with Dual Outputs Simultaneously Charged in a Half Cycle Achieving 92.2%-Efficiency and 131mW Output Power

Wireless power transfer to implanted devices is an elegant solution that can obviate the need for batteries [1-5]. As more functions are implemented in the implanted devices, more than one output voltages are typically requested for the optimal performance [6]. For example, a low output voltage (VOUT2) is used for biopotential recording whereas a high output voltage (VOUT1) is used in the back-end circuitry for neurostimulation. The requirements on VOUT1 and VOUT2 are different [7]. The front-end recording circuitry requires a stable and accurately regulated VOUT2 whereas the back-end stimulation circuitry necessitates a high bandwidth to support a high load current at VOUT1.