The class-E concept for efficient wide-band coupling-insensitive transdermal power and data transfer

This paper presents an innovative method for the transcutaneous transmission of RF power and digital data via an inductive link. The system is based on the single ended class-E power amplification scheme. A self oscillating class-E tuned power amplifier involving an inductive link permits high-efficiency coupling-insensitive power transmission. The oscillation frequency is not fixed but influenced by the coupling of the coils. Due to the excellent switching characteristics of the oscillator, Amplitude Shift Keying (ASK) may be employed for digital data transmission. Data decoding can easily be achieved by envelope detection. The realization of the system requires a small number of circuit components. It is employed for the transcutaneous transmission of digital data and power in a Cochlear Prosthesis system.