Abstract
We propose a batteryless wireless communication system for in vivo healthcare chips. The system uses inductive coupling at 13.56 MHz with internal and external coils, and employs pulse interval modulation (PIM) to endure the large attenuation in the human body. A wireless communication circuit is presented in this paper, and 16 mV of output voltage can be obtained at the external receiver. The antenna coil structure is investigated, and it is found that a tablet structure is suitable for the proposed system.
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