BIDIRECTIONAL WIRELESS DATA AND POWER TRANSFER OVER INDUCTIVE LINK

Apparatus and methods for transferring both power and data across an inductive link using coupled coils are disclosed. In some embodiments, a disclosed apparatus comprises: an external device and an internal device. The external device comprises: a first LC tank comprising a first coil, a switching power amplifier comprising a first switch electrically coupled to the first LC tank, and a first data modulator configured to implement on-off keying (OOK) to open and close the first switch. The internal device comprises: a second LC tank comprising a second coil that is inductively coupled to the first coil through an inductive link, a tank circuit comprising a second switch electrically coupled to the second LC tank, and a second data modulator configured to implement cyclic on-off keying (COOK) to open and close the second switch.