An efficient RF power transfer and bidirectional data transmission to implantable electronic devices

We present in this paper, a new technique that improves the performance of a radio-frequency (RF) link used, usually, to transfer power and data to implantable electronic devices (sensors and stimulators). The proposed technique, is based on a negative feedback circuit that includes a new duty-cycle controller to regulate the output of the power amplifier of the link. The technique is simple and reduces greatly the complexity of the RF link. A circuit based on this technique was simulated and the results show that the circuit operates correctly which demonstrates the effectiveness of our technique