Highly efficient AC power transfer in distributed biomedical implants using silicon-on-sapphire technology

This paper presents a highly efficient AC power transfer in supply-capacitor-less distributed bio-implant. A transfer system is designed using silicon-on-sapphire (SOS) technology CMOS transistors to transfer data and power from a surface implant to a chip-scale implant using only two wires. The proposed design achieves a high voltage conversion ratio and power transfer efficiency by reducing the conduction path voltage drop and controlling the rectifier transistors to minimize reverse current flow. For a 3 V, 1 MHz input signal and a load of 10 mA, the design obtains a power efficiency of 91% and a voltage conversion ratio of 0.95. All performance simulations are done on cadence software customized by the Peregrine Semiconductor Corporation to implement SOS technology.