Design and simulation of an inductive link using fully integrated receiver coil in biomedical implants

In this paper, an inductive link using an on-chip stacked square receiver coil (outer diameter of approximately 6 mm) is presented. An SOS (silicon on sapphire) process is employed to enhance the biocompatibility and to ensure a possible maximum power transfer. The capacitor used to build the LC tank for the receiver coil is also integrated on chip. With a carrier frequency of approximately 13MHz, the power module was able to reach 21% power transfer efficiency. With no requirement for external capacitors, this finding has shown the potential of fully integrated components with ultra-small size in the application of energy transfer in the field of biomedical implants.